The Pennsylvania authorities on Tuesday identified a 31-year-old man “with antigovernment leanings” as the suspect in last week’s ambush at a state police barracks that left one trooper dead and another wounded.

The suspect, Eric Matthew Frein, was the subject of a wide search on Tuesday after the police obtained a warrant charging him with, among other offenses, murder and recklessly endangering another person.

“He has made statements about wanting to kill law enforcement officers and also to commit mass acts of murder,” Frank Noonan, the state police commissioner, said at an afternoon news conference. “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.”

Mr. Noonan said the authorities were mounting “a tremendous, labor-intensive manhunt,” but he cautioned that Mr. Frein had training as a survivalist, which could make him especially elusive in the heavily wooded region.