Workers at an Onyx Pharmaceuticals facility in South San Francisco filed out of the building and into a parking lot Wednesday afternoon after employees reported smelling gas. They were sent off-site and the fire department said about two hours later that the building was safe, KTVU reports. Employees were to return today. About a year ago, employees at an Amgen ($AMGN) facility in South San Francisco were evacuated after a small explosion that sent two workers to the hospital. Story | More