The FBI is investigating after a disturbance on board an international flight to Germany forced the pilot to make an emergency landing at Denver International Airport.

Airport spokesman Heath Montgomery says the incident occurred Friday night on a Condor Airlines flight from Las Vegas to Frankfurt. The pilot diverted the plane to Denver after declaring an emergency.

The FBI, Transportation Security Administration and Denver Police Department met the plane at the gate.

Montgomery said Saturday that all passengers were safe, and the plane resumed the flight to Germany after refueling.