CANADENSIS, Pa. (AP) — Authorities don't have the alleged gunman who is accused of a deadly ambush at a police barracks, but they say they've found the AK-47-style assault rifle that he was carrying.

Pennsylvania State Police Lt. Col. George Bivens said Sunday that police believe their massive manhunt is hot on the trail of 31-year-old Eric Frein (freen) as he travels on foot through northeastern Pennsylvania's heavy forests where he grew up.

There's been no contact with or sightings of Frein since the Sept. 12 ambush that killed one trooper and critically wounded a second. Police believe he's still armed and dangerous, but that he's not targeting civilians.

Bivens says police are searching primarily in a several-square-mile area and are doing their best to guarantee the safety of area residents.