A man was slashed outside a roller-skating rink in San Francisco by a sword-wielding attacker reportedly wearing a "Make America Great Again" hat.

The San Francisco Chronicle reports that police were called after a man was slashed in the hand with a sword and left bleeding outside the rink.

Police told the Chronicle that the alleged attacker fled. Investigators were speaking to witnesses and attempting to review security video from the scene.

Police said the victim, whose name was not released, was attacked by a man allegedly seen wearing the signature hat from President Trump's campaign.

The incident reportedly started with a verbal altercation before the victim tried to grab the hat off the attacker's head. The attacker then reportedly grabbed a sword and slashed the victim in the hand, according to Officer Robert Rueca, a spokesman for the San Francisco police.

Scott Sweeney, a witness to the incident, told the Chronicle he recognized the alleged attacker wearing the red "MAGA" hat and heard him yelling homophobic slurs at the victim.

David Miles, owner of the Church of 8 Wheels roller-skating rink, posted a picture on Facebook showing the iconic red hat next to a pool of blood outside the establishment that garnered attention over the weekend.