Brooklyn rhymer Desiigner and Celtic player Jaylen Brown were expecting to connect with some of their fans in the Boston area on Monday.
Those plans were called off after over 1000 people showed up at CambridgeSide Galleria Mall and some attendees reportedly became violent.
Authorities were forced to shut down the event and evacuate the mall.
Police claim some people began pushing, and officers then used pepper spray to disperse the crowd.
According to the cops, some teenagers threw bricks and glass at officers.
Six juveniles were arrested for disorderly conduct, disturbing the peace, and trespassing.