Manhunt: Alleged cop killer spotted?

(CNN) - A possible break in the dangerous, three-week long manhunt for an accused cop killer and survivalist as police reveal there was a sighting in the past twenty-four hours.

Eric Matthew Frein is sought in the death of Cpl. Byron Dickson in a September 12 ambush outside the state police barracks in Blooming Grove. Trooper Alex T. Douglass was wounded in the attack.

Investigators also found two fully functional pipe bombs and believe that the manhunt may be taking a toll on the suspected cop killer, according to Pennsylvania State Police Lt. Col. George Bivens.

CNN Justice Reporter Evan Perez reports for The Lead.