Authorities hunkered down early Saturday in the neighborhood where a man suspected in the fatal shooting of a Pennsylvania State Police trooper lived with his parents, raising hopes they had him cornered a week after the ambush outside a rural police barracks.

For a second night, authorities closed roads near the home in a wooded neighborhood of Barrett Township, in the Pocono Mountains, and this time gunfire was reported in the area.

The shots were fired around 6:40 p.m. Friday, a Monroe County 911 dispatcher said. State police told residents in the townships of Price and Barrett to stay inside and asked others not to travel to the area because of heavy police activity.

About 20 people who couldn't get back to their homes took refuge at the Barrett Township firehouse, said township supervisor Ralph Megliola.

State police would not say whether they believe they have 31-year-old Eric Frein surrounded. Their last communication came shortly after 9 p.m. Friday when a spokeswoman asked the media to relocate at a staging area farther away from the scene.

As state police appeared to undergo a shift change, an unmarked helicopter flew overhead early Saturday, its lights off.

Police have charged Frein with opening fire outside a state police barracks in northeastern Pennsylvania on Sept. 12. Cpl. Bryon Dickson was killed and Trooper Alex Douglass was wounded by a gunman with a high-powered rifle.

Frein, called a self-taught survivalist with anti-law enforcement views, has been on the run ever since. He was placed on the FBI's 10 most wanted list, and hundreds of law enforcement officials have been searching for him in the dense woodlands.