Hunt for suspect in trooper ambush thought to be 'game' between survivalist, law enforcement

K9 units search for suspect Eric Frein, Wednesday, Sept. 24, 2014 in Canadensis, Pa. Frein, a suspect in the fatal ambush of a trooper has occasionally made himself visible to officers before melting back into the forest, and police found empty packs of Serbian-branded cigarettes and soiled diapers believed to have been left by him, Pennsylvania State Police said Wednesday. (AP Photo/The Times-Tribune, Jake Danna Stevens) WILKES BARRE TIMES-LEADER OUT; MANDATORY CREDIT (The Associated Press)

Pennsylvania State Police troopers and U.S. Marshals investigate and clear homes in the search for suspect Eric Frein, Wednesday, Sept. 24, 2014 in Canadensis, Pa. Frein, a suspect in the fatal ambush of a trooper has occasionally made himself visible to officers before melting back into the forest, and police found empty packs of Serbian-branded cigarettes and soiled diapers believed to have been left by him, Pennsylvania State Police said Wednesday. (AP Photo/The Times-Tribune, Jake Danna Stevens) WILKES BARRE TIMES-LEADER OUT; MANDATORY CREDIT (The Associated Press)

Authorities say the target of a massive manhunt may be playing a game with law enforcement as he hides in the woods of northeast Pennsylvania.

Police say they've caught glimpses of 31-year-old Eric Frein (freen) as recently as Tuesday. But they couldn't capture him in the rough terrain.

Frein is described as a self-taught survivalist with a vendetta against state police. He's charged with killing one trooper and wounding another during a Sept. 12 ambush of their barracks in Blooming Grove.

Authorities say Frein makes himself visible from distances where he's unlikely to be caught. He's reportedly left behind soiled diapers and empty cigarette packs in the wilderness.

Police said Wednesday the manhunt has included kicking bears out of caves and getting warrants to search vacant houses.