A passenger plane made a forced landing at Cardiff international airport on Friday after what was thought to be a brawl on board, police said.
"Details are very sketchy at the moment as it just landed onthe tarmac in the last couple of minutes," a South Wales police spokesman said.
"It was diverted here purely because of what was happeningon board. I imagine it's a fight among passengers. That's what it sounds like."
At one stage two RAF helicopters were scrambled after crew reported a disturbance on the plane.
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The plane was a Boeing 737 bound for Glasgow from Santiago de Compostela in northern Spain.It was thought to be carrying Glasgow Celtic fans returning from Thursday night's UEFA Cup soccer match against Spanish sideCelta Vigo.