`` It was not a terrorist attack , '' mayor says . Classes scheduled at other locations ... will continue as planned . The mayor of San Francisco said the city would be open to any assistance from federal authorities in their investigation into last week's deadly shooting at an office holiday party for employees of nearby G4S security company. Blast collapses first floor 's ceiling ; fire department searching for gas leaks . Buildings evacuated , including those used by a film and TV school and by Charles University .
`` It was not a terrorist attack , '' mayor says . The mayor of San Francisco said the city would be open to any assistance from federal authorities in their investigation into last week's deadly shooting at an office holiday party for employees of nearby G4S security company. Blast collapses first floor 's ceiling ; fire department searching for gas leaks . Buildings evacuated , including those used by a film and TV school and by Charles University .