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Pictures | Sat Dec 22, 2012 | 10:06pm EST

Police probe motive in deadly Pennsylvania shooting spree

A Blair County Sheriffs deputy talks with an arriving Pennsylvania State Patrol trooper along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich

A Blair County Sheriffs deputy talks with an arriving Pennsylvania State Patrol trooper along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday...more

A Blair County Sheriffs deputy talks with an arriving Pennsylvania State Patrol trooper along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich
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Hollidaysburg Police Sergeant David Gehret (L) and a Blair County Sheriffs Deputy keep people away from one of the crime scenes along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich

Hollidaysburg Police Sergeant David Gehret (L) and a Blair County Sheriffs Deputy keep people away from one of the crime scenes along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people...more

Hollidaysburg Police Sergeant David Gehret (L) and a Blair County Sheriffs Deputy keep people away from one of the crime scenes along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich
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Pennsylvania State Patrol Public Information Officer Jeff Petucce (L), Pennsylvania State Patrol Lieutenant Colonel George Bivens and Blair County District Attorney Rich Consiglio (R) speak to the media at the Geeseytown fire hall in Hollidaysburg, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich

Pennsylvania State Patrol Public Information Officer Jeff Petucce (L), Pennsylvania State Patrol Lieutenant Colonel George Bivens and Blair County District Attorney Rich Consiglio (R) speak to the media at the Geeseytown fire hall in Hollidaysburg,...more

Pennsylvania State Patrol Public Information Officer Jeff Petucce (L), Pennsylvania State Patrol Lieutenant Colonel George Bivens and Blair County District Attorney Rich Consiglio (R) speak to the media at the Geeseytown fire hall in Hollidaysburg, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich
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An ambulance from the Hollidaysburg American Legion Ambulance Service leaves the scene along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich

An ambulance from the Hollidaysburg American Legion Ambulance Service leaves the scene along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday...more

An ambulance from the Hollidaysburg American Legion Ambulance Service leaves the scene along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich
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People gathered and hugged while being kept away from the scene along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich

People gathered and hugged while being kept away from the scene along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead...more

People gathered and hugged while being kept away from the scene along Route 22 near the entrance to Canoe Creek State Park, in Blair County, Pennsylvania, December 21, 2012. Four people died on a Pennsylvania highway on Friday when a gunman shot dead three people and later was killed in a shootout with police, authorities said. Three state troopers were injured in the incident in Frankstown Township, about 100 miles east of Pittsburgh. REUTERS/Altoona Mirror/J.D. Cavrich
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