Pennsylvania State Police are trying to flush the man they suspect of killing a trooper out of dense, swampy northeastern Pennsylvania woodland.

Police say they are eliminating possible hiding places for the suspect, 31-year-old Eric Frein, including hunting cabins, campsites and other occasional residences in the Pocono Mountains.

An intense late-night search Thursday concentrated on the area around Frein's parents' home, with roads blocked and residents kept from their houses.

Frein is charged with killing 38-year-old Cpl. Bryon Dickson and wounding another trooper during an ambush at the Blooming Grove barracks last week.

Dickson's funeral was Thursday.