Authorities in San Francisco say they received reports that fireworks may have been responsible for a small blaze on Yerba Buena Island. The island lies in San Francisco Bay between San Francisco and Oakland. The fire broke out around 8 p.m. Sunday near the bridge's western span. Though it was under control about two hours later, it snarled traffic on the bridge. San Francisco Fire Department Assistant Chief Matthew McNaughton says authorities received reports by phone initially that fireworks may have been involved.