The beat goes on:

(Reuters) - 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.

Investigators suspect the shooter might have been driving when he opened fire, shooting people for unknown reasons, the Pittsburgh Tribune Review reported, citing an official with the Blair County Emergency Management Agency.

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