This undated PennDOT identification photo shows Eric Matthew Frein, 31, of Canadensis, Pa. (AP/PennDOT via Pennsylvania State Police)  Trooper ambush suspect Eric Frein performed extensive Internet research on how to avoid police manhunts, experimented with explosives and might have booby-trapped the woods where authorities are looking for him, Pennsylvania State Police said Friday, two weeks after the deadly attack outside a rural barracks.  Police looked through the hard drive of a computer used by Frein and found a search history that indicates he had been planning an attack for several years, Lt. Col. George Bivens said.  The 31-year-old self-taught survivalist is charged with opening fire at the Blooming Grove barracks on Sept. 12, killing one trooper and injuring another. He's been on the run ever since.  Police believe he's hiding in the woods around his parents' home in Canadensis.  "I suspect he wants to have a fight with the state police, but I think that involves hiding and running since that seems to be the way he operates," Bivens said. "I expect that he'll be hiding and try to take a shot from some distance from a place of concealment, as he has done in the past."  He said Frein had experimented with explosives, citing materials that police found and interviews with people who knew him. Trackers are proceeding through the thick woods as though they are booby-trapped, Bivens said.  He declined to say whose computer was searched. Police tried to look at Frein's own computer but he had removed the hard drive at some point before the ambush in Blooming Grove, Bivens said.
Authorities pursuing a survivalist accused of the fatal ambush at a state police barracks in Pennsylvania are looking for him in an abandoned hotel in the Pocono Mountains.