OAKLAND, Calif. — Fifteen people were shot during a Juneteenth celebration in Oakland, California, police said Thursday.

The violence broke out Wednesday night during an event at Lake Merritt that was largely peaceful, with as many as 5,000 in attendance, until a sideshow involving “motorbikes and vehicles” took place around 8:15 p.m. on the north side of the lake.

A fight broke out down the street from the sideshow and a crowd gathered in the area of the fight, police said. At least one person was taken into custody for assaulting an officer.

No suspects have been taken into custody in connection with the shooting, police said.

At least one gunshot victim was in critical condition. The victims’ ages ranged from 20 to 30 years old.

Police announced the injuries during a news conference Thursday.