UPDATE | Pa. State Police: Barracks ambush suspect sought mass murder

BLOOMING GROVE, Pa. (AP) — The suspect in the killing of a trooper and the critical wounding of another outside a rural barracks is a survivalist who has expressed a desire to kill law enforcement officers and commit mass murder, state police said Tuesday.

Eric Matthew Frein, 31, of Canadensis, Pa., is still armed with the .308-caliber rifle that he used to open fire on the barracks late Friday, State Police Commissioner Frank Noonan said at a news conference in which he revealed the suspect's name.

Noonan called Frein "extremely dangerous."

"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."

Frein was charged today with first-degree murder, homicide of a law enforcement officer and other offenses. About 200 law enforcement officials are combing the rural area of northeastern Pennsylvania marked by dense forest, but "we have no idea where he is," Noonan said.

A gunman killed Cpl. Bryon Dickson, 38, and critically wounded Trooper Alex Douglass outside the barracks during a late-night shift change, then slipped away.