Police probe motive in deadly Pennsylvania shooting spree

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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