Eric Frein left a handwritten letter detailing how he ambushed two state troopers in Pike County and escaped, CNN reported Monday.
The letter, which authorities believe Frein wrote, was found during the manhunt for the 31-year-old survivalist suspected in the Sept. 12 shootings, CNN said, citing two unnamed law enforcement sources.
A spokesman for Pennsylvania State Police declined to confirm the report.
“I understand some networks are reporting information obtained through sources,” Trooper Tom Kelly said in an email. “This is the only official source and I cannot confirm anything reported by ‘sources.’ “
CNN said it was unclear when and why the letter was written, and whether it was left on purpose or by accident. The network said the letter did not offer a motive for the shooting, which took place during a shift change at the state police barracks in Blooming Grove Township.
The attack killed Cpl. Bryon Dickson, 38, and seriously wounded Trooper Alex Douglass, 31.
Frein, of Canadensis in Monroe County, remained at large late Monday.
Federal authorities on Monday continued to stand guard near the last known possible sighting. Men with assault rifles in olive fatigues and wearing Kevlar vests stamped “FBI” stood along Route 447 just north of Clarks Road and on Clarks Road in Price Township looking north into the Todd Price Nursery, a tree farm that extends for about a mile.
On Sunday, police swarmed the nursery after a report of a possible sighting of Frein. The details surrounding the sighting were not clear, but a neighbor, Judy Baldaccini, told the Times-Tribune of Scranton that at least one cabin in that patch of woods appeared to have been broken into in the last week.
State police have theorized in public that Frein may try to break into cabins or vacant homes to seek shelter.
Police began swarming the nursery shortly after 4:15 p.m. Sunday. Troopers with dogs scouted the site while others trained rifles at the trees in a perimeter extending west on Clarks Road.
Earlier Sunday, patrols seemed relatively light around the home of Frein’s parents on Seneca Lane in the Canadensis section of Barrett Township, where Frein lived.
The search has been concentrated in that area since state police identified Frein as the shooting suspect Sept. 16. The sport utility vehicle he was known to drive was found abandoned in the woods about 3 miles north of the barracks.
Up to 1,000 police officers have searched for Frein.
Authorities have said he made his way south to Monroe County and attempted to use his cellphone to call home at least once. No one answered, but police were able to narrow their focus to a roughly 5-square-mile search zone straddling Barrett and Price townships near Delaware State Forest.
Frein has remained elusive despite increasingly chilly nights and sporadic bursts of rain. State police believe the stress is wearing him down and hope to capitalize on his mistakes.
Joseph Kohut of the Times-Tribune of Scranton and Reuters and Morning Call staff contributed to this story.