Police within the last day found two fully functional pipe bombs at sites where they believe accused state trooper killer Eric Frein hunkered down for the night while on the run in Barrett and Price townships.

Police also caught sight of Frein from a distance of about 75 to 100 yards in a thickly wooded area, also within the last 24 hours, Lt. Col. George Bivens said at a news conference Tuesday.Frein, 31, is accused of the Sept. 12 ambush attack on Cpl. Bryon Dickson, 38, and Trooper Alex Douglass, 31, during a shift change at the Blooming Grove barracks in Pike County. Dickson was killed; Douglass is recovering from serious injuries.The explosives were recovered along with other items within the search area, about five square miles on the Monroe-Pike county border, Bivens said.He would not specify what the items were, or where they were found.Bivens said the explosives were not deployed, but appeared to have been hastily left behind."There are things left behind that I expect he would want to take with him. In many cases, it's disorganized, appearing that he was in the process of using something that was left behind," Bivens said.He also said the bombs, which could be detonated either by a trip wire or a lit fuse, were brought to the site after the shootings, not before. The devices are now at an FBI crime lab to be analyzed."They could cause a lot of injury," he said.Bivens asked people to avoid the search area because Frein may have placed similar devices there.Bivens said that a flash-bang device heard yesterday in the area was from the search triggered by the sighting of a person police believe to be Frein.No survivalistIf Frein continues to leave items behind, as police have reported, it may suggest he isn't a real survivalist at all.Jim Gilmore, who coordinates military swap meets in the area and participated in re-enactments himself, said the man law enforcement officers seek is much more of a re-enactor than a survivalist."There are preppers and then there are true survivalists," said Gilmore, a Jim Thorpe resident. "Preppers say, I have a thousand rounds of ammunition so I'm in good shape. Survivalists run every possible scenario through their head and are ready for it. They generally don't make mistakes."The search for Frein in Barrett and Price townships has now entered its third week. About 1,000 officers are on the hunt for Frein. The search area on Monday moved slightly to the south, but still close to the county borders. Bivens said the search goes wherever new information leads authorities.Frein, 31, of Canadensis, is known as a self-styled survivalist, expert marksman and war game devotee. He's said to hold a grudge against police.According to police, he enjoys military role-playing, often portraying a 1990s Serbian soldier. Authorities believe Frein is hiding in places he had prepared well in advance of the ambush."He is a dangerous individual," Bivens said.Even true survivalists, however, will weaken without food, Gilmore said."You need so many calories per day or you're going to lose energy," he explained. "Yeah, you can eat berries and other little things, but there is no evidence he's had a lot of high-protein food. There is no report of a fire or anywhere he has been able to heat food. If he's eating meats or something like that, it has to be cold."No specific targetPolice believe Frein hid in the woods across from the Blooming Grove barracks and at 10:50 p.m., as shifts were changing, shot at Dickson, killing him, and then at Douglass.Bivens said police have no reason to believe the two were specifically targeted.On Sept. 15, a man walking his dog found a half-submerged Jeep about two miles from the barracks. The Jeep contained Frein's ID, cartridge casings matching bullets found at the barracks shooting scene, and an empty gun case.A subsequent search of Fein's home revealed more cartridge casings of the same type, a book on how to become a sniper, missing firearms, including an AK-47 and other evidence linking Frein to the shootings.During their intensive search, police have found an AK-47 type firearm, ammunition, soiled adult diapers and empty packs of the Serbian cigarettes Frein favored.The diapers are also being analyzed, but Bivens would not say if DNA tests confirmed they are Frein's."The only reason you would wear a diaper is if you are in a spot so close to the enemy that you can't move," Gilmore said. "Otherwise, you would just go right there on the spot."Evidence recovered from a computer revealed he planned the shooting for years, searching for ways to avoid manhunts and for information about police technology.SightingsPolice have reported catching glimpses of Frein several times, but he was too far away to capture.The scope of the search has centered around Frein's Canadensis home, where he lived with his parents.As heavily-armed state and federal law enforcement authorities continue the search in the densely wooded, rugged terrain of Pike County, the state Game Commission has given the go-ahead to bow hunters for the upcoming season.Bivens said the Game Commission is assessing the most recent information and is expected to issue a recommendation.He urged the hunters and hikers to use good judgment, and to call authorities if they see any items missing from cabins or deer stands, or any indication someone else might have entered them.Anyone with photos or videos taken from trail cameras, or anyone who has information about Frein, is asked to contact police at the tip line, 1-866-326-7256. The rewards for Frein's capture have reached $175,000.Bivens said police are trying to minimize road closures and vehicle checkpoints to lessen the impact on residents.As at earlier press conferences, Bivens spoke directly to Frein."I'm calling on you, Eric, to surrender. You are clearly stressed. You're making significant mistakes. we continue to take your supplies, and your weapon stockpiles. While you are no doubt weakening, our troopers' resolve is very strong," Bivens said. "We are not going anywhere."