BLOOMING GROVE TWP. - A search of a computer hard drive indicates Eric Matthew Frein planned his fatal attack on state police for years, authorities said Friday.

The hard drive was taken from a computer the 31-year-old suspected killer had access to and provided insight into techniques Frein may be using, such as how to avoid capture in a police manhunt and how to survive in the wilderness, said state police Lt. Col. George Bivens during a news conference in Pike County.

The deputy commissioner said Frein is a "coward" and state police are not intimated and will not go away until he is in custody.

"I believe it is a matter of time before we find him," Bivens said. "I am absolutely certain that we will capture him."

Anyone who sees Frein or has any information is urged to call tip line 1-866-326-7256.

Frein is accused of fatally shooting state police Cpl. Bryon Dickson II, 38, outside the barracks in Blooming Grove Township on Sept. 12. Trooper Alex Douglass, 31, also was shot but is recovering.

Frein did not own the computer where the evidence was found.

He did own a computer but removed the hard drive prior to the attacks, Bivens said.

Bivens also said there was no truth to a rumor that Douglass was familiar with Frein's sister.

"I'm told there was no relationship between the two," said the officer.

Douglass is in serious but stable condition, Bivens said.

Bivens said police are careful not to speculate on the specific motive for the shooting, though Frein is believed to have a grudge in general against law enforcement.

More than 100 law officials searched the historic, vacant Buck Hill Inn Friday morning but did not locate the suspect.

Bivens said searchers were alerted to the inn due to "information generated" through the investigation. He would not elaborate.

The inn has over 400 rooms and spans over 4,600 acres. It is off Route 390 in Barrett Township and about two miles from where investigators have been focusing their search.

Bivens said there is evidence that cabins and other structures - vacant and occupied - have been tampered with and police must investigate every one.

Police have reason to believe Frein may be carrying a radio, Bivens said.

There have been no sightings of the suspect since Wednesday, police said.

The sightings occurred as darkness fell and police were not in a position to apprehend the suspect due to the rugged terrain, Bivens said.

Trackers also are "taking into consideration" that Frein may have placed booby traps in the search area.

Pennsylvania State Police are being assisted by state police from New York and New Jersey, in addition to the FBI.

The award for information leading to the capture of Frein is $175,000.