A vehicle slammed into the crowd at great speed, witnesses said CBS News, and the driver stepped out and began shooting, which prompted police to shoot back.
Gunfire can be heard in the background of video from the event that has been published online, showing people fleeing the area.
Officials have warned that the death toll may increase, and the wounded have been sent to local hospitals.
Investigators were still trying to determine the motivation, but it was established that the suspect had been killed in a gunfight with the police.
