CANADENSIS, Pa. (AP) - Authorities who spent the night in the neighborhood where a man suspected in the fatal shooting of a Pennsylvania State Police trooper lived with his parents donned bulletproof vests and gathered heavy rifles before scattering Saturday morning.

The burst of activity followed a long night that included gunshots and police telling residents to stay in their homes.

Police gave no information about the Saturday morning activity.

Authorities Friday night had closed roads in the wooded neighborhood of Barrett Township, in the Pocono Mountains. The shots were fired around 6:40 p.m., 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. Those who had been kept away were allowed to return to their homes Saturday morning, but told to shelter in place.

About 20 people who couldn' t get back to their homes had taken 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.

Described as a self-taught survivalist with a grudge against law enforcement and government, Frein 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 surrounding his home in Canadensis. Schools in the area were closed again Friday.

Al and Debbie Mundy spent the night in their pickup after going out for groceries Friday night. When they got to the end of the road, a state trooper told them they would not be permitted back into the neighborhood.

"They would not let us turn around to go a quarter-mile back to our house," Al Mundy said.

Canadensis resident Richard Barry couldn't get home from work Friday night before the roadblocks went up. Barry said Saturday morning that he heard from family members who were at home and they told him police were going through their yard and the dog was barking.

Worried about his family, he said he preferred to wait near police in hopes of hearing something rather than staying overnight at the firehouse.

"I'm hoping that sooner or later he (Frein) just says 'I give up. You win,'" Barry said.