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Boston Marathon bombing investigation turns to motive

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Members of the FBI Evidence Recovery Team work around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team work around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team work around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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A member of the FBI Evidence Recovery Team works around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

A member of the FBI Evidence Recovery Team works around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

A member of the FBI Evidence Recovery Team works around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Members of the FBI Evidence Recovery Team work around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team work around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team work around the home where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Orange paint denotes where spent shotgun and rifle casings lie in the yard where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Orange paint denotes where spent shotgun and rifle casings lie in the yard where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Orange paint denotes where spent shotgun and rifle casings lie in the yard where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Bullet holes are marked in yellow at a garage door while the FBI Evidence Recovery Team gathers evidence in the yard where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013.REUTERS/Lucas Jackson

Bullet holes are marked in yellow at a garage door while the FBI Evidence Recovery Team gathers evidence in the yard where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, at 67 Franklin St. in Watertown, Massachusetts, April 20,...more

Bullet holes are marked in yellow at a garage door while the FBI Evidence Recovery Team gathers evidence in the yard where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013.REUTERS/Lucas Jackson
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Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Members of the FBI Evidence Recovery Team inspect the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding at 67 Franklin St. in Watertown, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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An aerial image shows the police searching a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial image shows the police searching a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial image shows the police searching a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout
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An aerial infrared image shows the outline of Dzhokhar Tsarnaev in a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial infrared image shows the outline of Dzhokhar Tsarnaev in a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial infrared image shows the outline of Dzhokhar Tsarnaev in a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout
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An aerial infrared image shows the outline of Dzhokhar Tsarnaev in a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial infrared image shows the outline of Dzhokhar Tsarnaev in a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial infrared image shows the outline of Dzhokhar Tsarnaev in a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout
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An aerial image shows the police searching a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial image shows the police searching a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial image shows the police searching a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout
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An aerial infrared image shows a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial infrared image shows a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout

An aerial infrared image shows a boat during the manhunt in Watertown, Massachusetts, April 19, 2013, courtesy of the Massachusetts State Police. REUTERS/Massachusetts State Police/Handout
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Law enforcement evidence technicians continue to investigate the scene of the Boston Marathon bombings as other investigators (rear) use a fire department ladder truck to search for evidence in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

Law enforcement evidence technicians continue to investigate the scene of the Boston Marathon bombings as other investigators (rear) use a fire department ladder truck to search for evidence in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

Law enforcement evidence technicians continue to investigate the scene of the Boston Marathon bombings as other investigators (rear) use a fire department ladder truck to search for evidence in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg
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Law enforcement evidence technicians continue to investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

Law enforcement evidence technicians continue to investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

Law enforcement evidence technicians continue to investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg
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A woman writes a message at a memorial for victims in front of a sign thanking the Boston Police Department and other law enforcement near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

A woman writes a message at a memorial for victims in front of a sign thanking the Boston Police Department and other law enforcement near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

A woman writes a message at a memorial for victims in front of a sign thanking the Boston Police Department and other law enforcement near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg
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Law enforcement officials investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Law enforcement officials investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Law enforcement officials investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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Maret Tsarnaev, aunt of Boston bombing suspects, speaks in Toronto, Ontario on April 19, 2013 in this still image from a video footage courtesy of CBC. REUTERS/CBC/Handout

Maret Tsarnaev, aunt of Boston bombing suspects, speaks in Toronto, Ontario on April 19, 2013 in this still image from a video footage courtesy of CBC. REUTERS/CBC/Handout

Maret Tsarnaev, aunt of Boston bombing suspects, speaks in Toronto, Ontario on April 19, 2013 in this still image from a video footage courtesy of CBC. REUTERS/CBC/Handout
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Two women hug at a memorial for victims as investigators (L-Rear) continue to search for evidence near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013.REUTERS/Jim Bourg

Two women hug at a memorial for victims as investigators (L-Rear) continue to search for evidence near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013.REUTERS/Jim Bourg

Two women hug at a memorial for victims as investigators (L-Rear) continue to search for evidence near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013.REUTERS/Jim Bourg
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A woman comforts her son as they sit at a memorial for victims near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

A woman comforts her son as they sit at a memorial for victims near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

A woman comforts her son as they sit at a memorial for victims near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg
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Law enforcement agents take tactical positions as they look around the corner of a house at the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, in this picture taken from a neighbour's house across the street, in Watertown, Massachusetts April 19, 2013. REUTERS/Lucy Lovrien

Law enforcement agents take tactical positions as they look around the corner of a house at the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, in this picture taken from a neighbour's house across the street, in Watertown,...more

Law enforcement agents take tactical positions as they look around the corner of a house at the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, in this picture taken from a neighbour's house across the street, in Watertown, Massachusetts April 19, 2013. REUTERS/Lucy Lovrien
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Vito Nicastro (R) of Dover, Massachusetts kisses Tamara Seretta (L) to comfort her as she cries at a memorial to the victims of the Boston Marathon bombings up Boylston Street from the scene of the blasts (rear) in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

Vito Nicastro (R) of Dover, Massachusetts kisses Tamara Seretta (L) to comfort her as she cries at a memorial to the victims of the Boston Marathon bombings up Boylston Street from the scene of the blasts (rear) in Boston, Massachusetts, April 20,...more

Vito Nicastro (R) of Dover, Massachusetts kisses Tamara Seretta (L) to comfort her as she cries at a memorial to the victims of the Boston Marathon bombings up Boylston Street from the scene of the blasts (rear) in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg
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A woman touches a teddy bear as another writes a message at a memorial to the victims near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

A woman touches a teddy bear as another writes a message at a memorial to the victims near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg

A woman touches a teddy bear as another writes a message at a memorial to the victims near the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Jim Bourg
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Law enforcement agents take tactical positions as they look around the corner of a house at the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, in this picture taken from a neighbour's house across the street, in Watertown, Massachusetts April 19, 2013.REUTERS/Lucy Lovrien

Law enforcement agents take tactical positions as they look around the corner of a house at the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, in this picture taken from a neighbour's house across the street, in Watertown,...more

Law enforcement agents take tactical positions as they look around the corner of a house at the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding, in this picture taken from a neighbour's house across the street, in Watertown, Massachusetts April 19, 2013.REUTERS/Lucy Lovrien
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Law enforcement officials investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Law enforcement officials investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson

Law enforcement officials investigate the scene of the Boston Marathon bombings in Boston, Massachusetts, April 20, 2013. REUTERS/Lucas Jackson
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An FBI officer stands in front of the house at 67 Franklin St. after the capture of Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts, April 19, 2013. REUTERS/Lucas Jackson

An FBI officer stands in front of the house at 67 Franklin St. after the capture of Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts, April 19, 2013. REUTERS/Lucas Jackson

An FBI officer stands in front of the house at 67 Franklin St. after the capture of Dzhokhar Tsarnaev, the surviving suspect in the Boston Marathon bombings, in Watertown, Massachusetts, April 19, 2013. REUTERS/Lucas Jackson
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