Two people jumped a security fence at a GE Hitachi research reactor near San Francisco, the U.S. nuclear power regulator said on Thursday, raising concerns over a plant that is one of the few in the country that uses highly enriched uranium, a material that could be used to make an atomic bomb.
The intruders jumped a security perimeter fence at the Vallecitos reactor in Alameda County on Wednesday afternoon, a 1,600-acre (647.5-hectare) site about 40 miles (64 km) east of San Francisco, the U.S. Nuclear Regulatory Commission said on its website in a security threat notice.
Shortly afterward the intruders "exited the area when being approached by security prior to being detained," it said. The plant notified local law enforcement and state emergency services about the event.