Security guards shot at when they responded to fatal shooting of a 15-year-old boy in Vallejo FacebookTwitterEmail A file photograph of Vallejo Police Department headquarters is seen in Vallejo, Calif. on Tuesday, July 14, 2015.Paul Chinn/The Chronicle After the fatal shooting of a 15-year-old boy in Vallejo on Wednesday evening, several people armed with handguns opened fire at security guards who responded to the shooting, but the gunfire struck no one, police said Thursday. Officers found a teen who had been shot when police responded at 5:52 p.m. to a report of multiple shots fired in the 200 block of Maine Street in south Vallejo, police said. The teen — whose name is being withheld because he is a minor — died at the scene.