The suspect in the slaying of a Pennsylvania state trooper has been added to the Federal Bureau of Investigation's "Ten Most Wanted Fugitives" list.

Eric Matthew Frein, 31, of Canadensis, is the 503rd person placed on the list."When law enforcement officers are violently targeted, we take it seriously, and personally," said Edward J. Hanko, special agent in charge of the FBI's Philadelphia Division."The FBI is committed to finding this suspect, keeping the public safe, and supporting our partners at the Pennsylvania State Police."The FBI is offering a reward of up to $100,000 for information leading directly to Frein's arrest. That's in addition to the $75,000 reward offered by the Pennsylvania Crime Stoppers.Tips can be called in to the state police at 866-326-7256, or to the nearest FBI Field Office.Police believe Frein fatally shot Cpl. Bryon Dickson, 38, and wounded trooper Alex Douglass, 31, outside the Blooming Grove barracks in Pike County on Friday. Dickson, of Dunmore, had previously served at Fern Ridge barracks and conducted aggressive driving campaigns in both Carbon and Monroe counties.An emotional funeral service was held in Scranton Thursday.The shooting left Douglass in critical condition. He has undergone surgeries and will need more, according to state police.State arrest warrants were issued after Frein was charged with homicide, homicide of a law enforcement officer and attempted murder, among other charges.Frein is also charged federally with unlawful flight to avoid prosecution.Police believe Frein shaved his head on both sides and has long hair on top. He is known to be a heavy smoker, a weapons enthusiast, and a survivalist, and has studied the Russian and Serbian languages.He claims to have fought with Serbians in Africa.Additional information regarding Frein, including his wanted poster, is available on the FBI's website at

http://www.fbi.gov.Thursday night, police closed roads in the area where the self-taught survivalist lived with his parents. Residents were kept temporarily from their homes while police searched hunting cabins, campsites and other occasional residences in the Pocono Mountains."We're systemically taking away any opportunities for him for cover and concealment, for any comfort," Lt. Col. George Bivens told reporters Thursday afternoon, hours after the funeral for Dickson.As many as 200 law enforcement officers at a time have been casting a wide net around the crime scene, exploring rugged terrain so impenetrable in spots that police choppers can't see through the forest canopy.Schools in the area were closed again Friday as authorities searched for Frein."We have now made the world where he could hide a very, very small place," said Edward Hanko, special agent in charge of the FBI's Philadelphia office.