June 5, 2009 4:00 pm Underground Explosion Sparks Manhole Fire Flames and thick black smoke jumped two stories in the air Friday afternoon in San Francisco’s Tenderloin District. US & World Videos 2:19 Triple sweet graduation for Bonita Vista High School sisters 3:32 Parents of surfers killed in Mexico remember their sons 0:58 Philanthropist Joan Jacobs dies at 91 year old 2:32 How water pollution is changing how Imperial Beach lifeguards protect people 2:56 Pro-Palestinian protesters move to downtown jail