This photo shows a burning police motorcycle on Post Street in San Francisco. Beyond the motorcycle, a crowd of demonstrators stands and watches. The demonstrators stand adjacent to the United Airlines building at the corner of Powell Street, near Union Square. Spectators also watch from the building's windows. Photographers and film crews stand among the demonstrators. The end of a bus is visible on the right-hand side of the photo. Two city buses are stopped on Post street behind the line of demonstrators. A second police motorcyle is partially visible on the left-hand side of the photo. Debris, including rocks and a knocked-down barricade, litter the street around the motorcycle. A description written in black pen on the back of the photograph reads,"Cops motor cycle [sic] burned on Post St". On May 12, an anti-war demonstration protesting President Richard Nixon's Vietnam war policies (specifically Nixon's recently announced strategy to mine North Vietnamese harbors) was held in front of the St. Francis Hotel. Both California Govenor Ronald Reagan and New York Govenor Nelson Rockefeller were staying at the hotel during an official "kick-off" for Nixon's re-election campaign. Three thousand plus demonstrators attended the noontime rally, which turned violent when a police motorcycle was set afire. There were sixty arrests and numerous injuries.