An explosion rocked a Southern California medical office building Tuesday, killing a woman and injuring three other people, authorities said. Orange County Fire Authority Chief Brian Fennessy said 70 firefighters were dispatched in response to a 1:09 p.m. Tuesday call from Aliso Viejo. Bomb technicians from the Orange County Sheriff's Department, the FBI and other agencies were investigating, said Paul Delacourt of the FBI. Mary McWilliams told the Orange County Register that she arrived for an appointment to find smoke surrounding the area and car alarms going off. McWilliams said she saw two burned women staggering out of the building, covered in ash and soot.

Source: Fox News May 16, 2018 03:45 UTC