The FBI says suspected shooter John Williams is still at large, and it is offering a reward of up to $20,000 for information leading to his arrest.

The manhunt continues for the man suspected of killing Somerset County Sheriff's Deputy Eugene Cole Wednesday morning in Norridgewock and stealing his fully marked police cruiser. Williams can be seen in images from the cruiser's dash-cam stealing from the Cumberland Farms convenience store in Norridgewock before abandoning the vehicle off Martin Stream Road in that town.

At a media conference this afternoon, Somerset County Sheriff Corporal Dale Lancaster said the community can expect to hear and see air support this evening, as searchers take advantage of a break in the weather. Planes and helicopters will be combing the county, looking for any sign of the suspect. Lancaster once again sent a message to Williams, asking him to please turn himself in, adding a request to surrender peacefully. Residents are urged to keep their doors locked and remain vigilant, reporting any suspicious activity to law enforcement. Williams is considered armed and extremely dangerous. Anyone who sees him should NOT approach him, but call 911 immediately.

FBI Boston Special Agent Hank Shaw said anyone with pertinent information, or who thinks they've seen Williams should contact the Maine State Police at (207) 624-7076 or electronically at Tips.FBI.gov. A reward of up to $20,000 is being offered for information that leads to Williams' arrest.

WGME-TV reports the suspect's girlfriend, Kristina Pomerleau, was arrested Saturday for possession of drugs. Williams was with her at the time of the arrest, but was not charged. Corporal Cole was present when she was taken into custody but officials are not commenting on whether they think that had anything to do with the shooting. Pomerleau is currently in the Somerset County Jail. She lives just off Martin's Stream Road, where Cole's cruiser was found abandoned.