TRENTON, Maine — State police are trying to determine whether compartments found open on two jets at the Hancock County-Bar Harbor Airport were left that way by mistake or whether it was a criminal act, according to Maine State Police Trooper Cliff Peterson.

Pilots for NetJets arrived at the airport Monday before a scheduled 8:15 a.m. flight to find that compartments on two of the company’s Cessna Citation X jets had been unlocked during the night.

If only one of the units housing electronic equipment had been left open, the pilot told police, he would have thought it was an oversight, but two compartments being open appeared to be suspicious.

Nothing was taken from either compartment and there was no damage to either jet, Peterson said.

“None of it appeared to be tampered with,” he said.

Police are continuing to investigate, and airport security is reviewing surveillance video.