Pennsylvania police believe they have found writings by alleged cop-killer Eric Frein, authorities announced on Wednesday. Cops say they are “absolutely certain” the journal discovered in the woods and other found items belong to Frein. The journal details Frein’s ambush of state troopers. "He dropped. I was surprised at how quick. I took a follow-up shot on his head, neck area. He was still and quiet after that," reads the journal. “After reading this cold-blooded account, I can only describe Frein's actions as pure evil," said Lt. Col. George Bivens. He also announced that Frein will be charged with possessing weapons of mass destruction after cops discovered pipe bombs in the Poconos woods where he is believed to be hiding. There have been four possible sightings of Frein since Friday, but he is difficult to capture because the brush is so thick in the area. Millions of dollars have already been spent on the three-weeks long search for Frein, police said.