Authorities believe Eric Matthew Frein is still in the Monroe County area and they have recovered numerous items in their search for the suspected police killer, including an AK-47 rifle and ammunition.e

 Authorities believe Eric Matthew Frein is still in the Monroe County area and they have recovered numerous items in their search for the suspected police killer, including an AK-47 rifle and ammunition.

"We strongly believe we are in the right area," said state police Lt. Col. George Bevins during a news conference Sunday afternoon from the Blooming Grove Township municipal building.   Bevins said Frein is "moving as we push him."

The officer said at this time police still believe Frein is acting on his own without assistance from anyone. Authorities believe he traveled on foot from where the shooting happened at the barracks in Lords Valley, Pike County, to the Barrett Township area of Monroe County, roughly 20 miles away.   Anyone with information is urged to call the tip line: 1-866-326-7256.   Frein is suspected of ambushing Cpl. Bryon Dickson as the state police officer left the Blooming Grove barracks shortly before 11 p.m. Sept. 12.   Dickson was fatally shot with a .308 rifle.   Another trooper, Alex Douglass, was critically wounded in the shooting but is recovering.   The reward for the capture of Frein is $175,000. He is currently on the FBI's Most Wanted list.   The main area where authorities are concentrated is "several square miles" in the Barrett Township region, where Frein had lived with his parents, but the overall search is spanning between 200 and 250 square miles, Bevins said.   "I believe, based on everything we're getting back, that he is in the immediate area," he said.   Bevins added, "I want to reiterate to him (Frein) that he needs to turn himself in to state police. We will apprehend him. It's just a matter of time."   The officer described the terrain where the search is occurring as very rugged with caves and deep underbrush.   "It's not an easy place to be searched," he said, noting officers must be careful since the suspect has already targeted them.   The AK-47, along with rifle magazines and a bag of ammunition for that weapon, were found in the area not far from the barracks where the troopers were shot.   Bivens said it appeared Frein had been planning the attack for some time and had a grudge against state police.    "His fight is with law enforcement," Bivens said, noting that average citizens need to be vigilant but aren't targets.   The suspect also has a desire to portray himself as a Serbian soldier, said Bivens.