Oakland police conducted a coordinated operation Sunday targeting a large gathering of dirt bike and ATV riders on the Bay Bridge, resulting in nine arrests and the seizure of 77 vehicles.

Police Chief James Beere announced the results of the operation during a Monday press conference, describing it as a planned enforcement action involving over 100 officers. The operation specifically targeted what authorities characterized as an unauthorized takeover of the bridge by off-road vehicle riders.

The department utilized drone technology to track and monitor the riders during the operation, according to police statements. The enforcement action was part of ongoing efforts to address unauthorized vehicle gatherings on public roadways and infrastructure.

The seized vehicles included a mix of dirt bikes and all-terrain vehicles that had participated in the bridge takeover. Police have not released details about the specific charges filed against the nine individuals arrested during the operation.

Such unauthorized vehicle gatherings, often called "takeovers," have become an ongoing concern for law enforcement agencies across the Bay Area. The events typically involve groups of riders performing stunts and blocking traffic on public roads and bridges.