Police work to eliminate hiding places in woods for suspect in Pennsylvania troopers' ambush

An honor guard carries the casket of Pennsylvania State Trooper Cpl. Bryon Dickson from his funeral service, Thursday, Sept. 18, 2014, in Scranton, Pa. Dickson was killed on Friday night in an ambush shooting at the state police barracks in Blooming Grove Township. Authorities are looking for 31-year-old Eric Frein, of Canadensis, who has been charged with killing one trooper and wounding another outside the barracks. (AP Photo/Matt Slocum) (The Associated Press)

Law enforcement officers gather before a funeral service for Pennsylvania State Trooper Cpl. Bryon Dickson, Thursday, Sept. 18, 2014, in Scranton, Pa. Dickson was killed on Friday night in an ambush shooting at the state police barracks in Blooming Grove Township. Authorities are looking for 31-year-old Eric Frein, of Canadensis, who has been charged with killing one trooper and wounding another outside the barracks. (AP Photo/Matt Slocum) (The Associated Press)

A law enforcement officers holds a folded United States flag before a funeral service for Pennsylvania State Trooper Cpl. Bryon Dickson, Thursday, Sept. 18, 2014, in Scranton, Pa. Dickson was killed on Friday night in an ambush shooting at the state police barracks in Blooming Grove Township. Authorities are looking for 31-year-old Eric Frein, of Canadensis, who has been charged with killing one trooper and wounding another outside the barracks. (AP Photo/Matt Slocum) (The Associated Press)