Pennsylvania State Police paused to pay tribute to their fallen comrade, then got back to work hunting for the man suspected as his killer — a self-taught survivalist they are trying to flush out of dense, swampy northeastern Pennsylvania woodland, reports the Associated Press.

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 homes temporarily.

Frein is charged with killing Cpl. Bryon Dickson, 38, and wounding Trooper Alex Douglass in a late-night ambush outside the Blooming Grove barracks a week ago. As many as 200 law enforcement officers at a time have been casting a wide net around the crime scene, exploring rugged terrain so impenetrable in spots that police choppers can't see through the forest canopy.