Small 'stockpiles or campsites' discovered in search for escaped Pennsylvania inmate with survivalist skills, police say

Authorities in Pennsylvania said Sunday they discovered "small stockpiles or campsites" in wooded areas they believe are associated with self-taught survivalist and prison escapee Michael Charles Burham.

Pennsylvania State Police said the discovery was made in wooded areas around Warren, a small city in northern Pennsylvania about 60 miles from Lake Erie.

Authorities continue to search for Burham, described as a "dangerous" inmate with survivalist skills and military experience, who they say escaped Warren County Prison by elevating himself on exercise equipment and using tied-up bedsheets to descend from the roof, according to a county spokesperson.

Police in the city of Warren said Friday in social media posts officials discovered Burham - who was being held on arson and burglary charges and was a suspect in a homicide investigation - had escaped.

Warren police said Burham "was also associated with the prior carjacking and kidnapping of a local couple while trying to escape capture."

Federal, state and local agencies were involved in an expanded search beyond Warren on Saturday as Burham's whereabouts remained unknown, according to an update from police.

Authorities say Burham may be hiding in the woods near Warren, which is about 18 miles from Jamestown, New York. The city is just outside the Allegheny National Forest.