San Francisco, June 21 : A shooting during a Juneteenth celebration at Lake Merritt in Oakland, US state of California, left 15 people injured, the police said.

The crowds were peaceful until around 8:15 p.m. local time on Wednesday when an illegal sideshow involving vehicles and motorbikes occurred near Grand Avenue and Bellevue Avenue, Oakland Police Department said on Thursday in a press statement.

During the sideshow, someone walked onto the hood of a car, which led to the occupants getting out and assaulting that person. Then came the gunfire, Oakland Police Department Chief Floyd Mitchell said at a press conference on Thursday noon.

The Oakland Fire Department said it transported at least four gunshot victims to a local hospital.

Police also took some victims to nearby hospitals. Other victims were self-transported.

/IANS