Eric Frein, 31, is believed to be surrounded by police in Pennsylvania as of Saturday morning. A survivalist, Frein is suspected of opening fire at the Pennsylvania State Police barracks in Pike County’s Blooming Grove, killing Cpl. Bryon Dickson and critically wounding State Trooper Alex Douglass Sept. 12.

The manhunt for Frein entered its sixth day Saturday, and police have spent the last two nights surrounding a Barrett Township home belonging to Frein’s parents where he stayed before the shooting, the Associated Press reported. The heavy police presence in the area has led to road shutdowns and authorities asking residents to stay inside their homes during the manhunt. Shots were heard Friday around 6:40 p.m. EDT, and police in bulletproof vests and carrying heavy rifles were seen Saturday morning.

Despite the heavy police presence, Debbie Truong, reporting for the Patriot-News in Harrisburg, tweeted that the scene is “relatively quiet”:

The FBI placed Frein on the agency’s 10 Most Wanted fugitive list Thursday, warning he should be “considered armed and extremely dangerous.” It is unclear why Frein opened fire at the barracks, but he is believed to have long held a grudge against the police, the New York Daily News reported. Frein’s 2001 Jeep Cherokee was discovered near the barracks, and police subsequently found one or more forms of identification, shell casings, military clothing and face paint.