Frein has been charged with murder, assault and several other counts following the shooting Friday night near a state police barracks in Blooming Grove, in the northeastern corner of the state.

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Cpl. Bryon Dickson was killed, while another trooper, Alex Douglass, was seriously wounded. Noonan later described the shooting as “an ambush,” saying that the troopers were shot without warning while one was heading to the barracks and the other was leaving it.

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The office of Pennsylvania Attorney General Kathleen G. Kane released this photo of Frein and called on anyone with any information to call the state police tip line:

Shell casings matching those used in the shooting were discovered in a vehicle not far from the barracks, along with information that identified Frein, Noonan said.

Noonan described Frein as a “survivalist” and said he has spoken before about killing police officers and other people.

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“He has made statements about wanting to kill law enforcement officers and also to commit mass acts of murder,” Noonan said. “What his reasons are, we don’t know. But he has very strong feelings about law enforcement and seems to be very angry with a lot of things that go on in our society.”

Authorities have warned in recent years that people with particularly violent feelings toward law enforcement officers could pose a growing threat and target such officers or government officials. The number of ambushes of police officers has also increased in recent years, according to the National Law Enforcement Partnership to Prevent Gun Violence.

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A large search effort involving about 200 officers is searching a forest-covered stretch of Pennsylvania for Frein, according to police. But they had not been able to locate him as of Tuesday afternoon.