Police and federal agents are questioning three passengers after a jetliner bound for Tokyo was diverted to San Francisco International Airport this afternoon.

At least one of the passengers assaulted a flight attendant on board American Airlines Flight 61, according to the Federal Aviation Administration.

The Boeing 777 took off from Dallas-Fort Worth International Airport at 12:21 p.m. Central time, and was headed to Tokyo Narita International Airport, according to the FAA.

After the onboard incident, the plane was diverted to SFO, where it landed about 3:15 p.m.

Three passengers – one female and two male–were removed from the plane for questioning, SFO Duty Manager Jeff Littlefield said.

Littlefield said he did not know exactly what happened on board the flight, but that the passengers were involved in “disruptive behavior.”

All other passengers and crew remained on the plane, which refueled at SFO and was scheduled to resume its flight to Tokyo within the hour, Littlefield said.

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