TEMPE, Ariz. » Police say an unidentified man used a samurai sword in order to stop a fight on the light rail in Arizona.

KSAZ-TV reports that the man pulled out his weapon after a fight broke out early Saturday morning.

Passenger Juan Vargas says the passengers all went quiet when the man pulled out the sword to break up the would-be brawl.

Vargas says he took a video of the sword-wielding man and posted it on YouTube.

Valley Metro and Phoenix Police are investigating the case but no arrests have been made.

Valley Metro officials say they have increased security during their late night service.