UK & World News
California Rattled By Strong Earthquake
Three people have been critically injured after a 6.0 magnitude earthquake shook California's Napa and Sonoma counties.
The quake, which was felt 40 miles (64 kilometres) away in San Francisco, set off car alarms and caused residents to run out of their homes in the middle of the night.
Some 87 people received minor injuries after the quake struck at 3.20am (11.20am UK time) at a depth of seven miles.
California's governor has declared a state of emergency.
Pictures posted on Twitter showed firefighters putting out a blaze at a mobile home park in Napa Valley and piles of rubble and masonry lying in the street which had fallen from buildings.
A 2.6 magnitude aftershock hit half-an-hour later and US Geological Survey (USGS) expert Jessica Turner told KCBS radio that aftershocks of up to 5.0 are likely in the coming week.
The shocks will be examined by geologists to determine whether the quake happened on a geological fault line.
The USGS added there was a "low likelihood for casualties", but issued an "orange alert" for possible damage, which means "significant damage is likely and the disaster is potentially widespread".
Californian police closed several roads that suffered significant damage and warned drivers to take extra care while crossing an intersection in Napa Valley strewn with bricks after a building partially collapsed.
Engineers were dispatched to assess the damage and restore power to some 50,000 residents in Napa and Sonoma who suffered a blackout.
Randy Baldwin, a USGS geophysicist, said the tremor was potentially damaging because it was close to populated areas.
"It is the strongest quake in a 60-mile (100-km) radius from the epicentre of this quake in several decades," he said.