SANTA CRUZ, Calif., May 4 (UPI) -- The FBI has joined the investigation into a weekend riot in Santa Cruz, Calif., that police say was instigated by an anarchist group.
The event was billed as a May Day party on fliers posted at the University of California at Santa Cruz and elsewhere, the Santa Cruz Sentinel reported. About 250 people showed up Saturday to attend the unauthorized party.
The FBI confirmed Monday it had joined the investigation.
Investigators say the party was a cover for violent action by masked demonstrators who threw rocks through the windows of some downtown businesses, attacked a police car that was covered with paint and scrawled graffiti on walls. Total damage was estimated at $100,000.
On Monday, police said two calls were made to 911 reporting shootings that never occurred. They said the calls might have been done to lure police officers away from downtown.
The SubRosa coffeehouse, a self-described anarchist organization in Santa Cruz, released a brief statement Tuesday denying any part in the violence.