An Alaska Airlines flight bound for San Francisco diverted and landed in Portland, Oregon. when a passenger sitting in a reclining position in the cockpit attempted to shut down the engines.

The aircraft operating flight 2059 was diverted on Sunday due to a “credible” threat to its safety, the company said in its statement.

The Federal Aviation Administration (FAA) clarified, in a statement to airlines, that the passenger in question attempted to disable the engines of an Embraer 175 aircraft, activating the fire extinguishing system. The crew managed to immobilize him and remove him from the cockpit.

“Just to let you know… We got this guy out of the cockpit who tried to shut down the engines” the pilot can be heard saying in the control tower, according to an audio document released by LiveATC. “It doesn’t seem to be causing any trouble back there. I think they restrained him… We want law enforcement (at the airport) as soon as we land,” he added.

According to the Multnomah County Sheriff’s Office, the 44-year-old man has been charged with 83 counts of attempted murder. The Seattle Times reports that the “passenger” was an off-duty Alaska Airlines pilot.

The FAA clarified, in a separate update to airlines today, that this incident is “in no way connected to current international events” but “it is always good to remain vigilant.”