A reporter for the San Francisco Chronicle, Will Kane, has tweeted photos of the damage in a convenience store in the town of American Canyon - close to the epicentre of a powerful earthquake.
Here's the 7-11 in American Canyon, which is now so busy ppl buying batteries, water that the clerk can't clean up. http://t.co/IGUd0G0kmo
Here's what it looks like at the 7-11 in American Canyon, which is now busy people buying batteries, water. http://t.co/fEVrs2lDL4
More top news
The prime minister was shouted at as she left the scene of the tragedy in which at least 79 people died.
Father-of-six Makram Ali, 51, was already receiving medical treatment as the attack unfolded. He died from multiple injuries, police say.
A review of how police and security services dealt with the latest terror attacks in the UK is to be launched, Amber Rudd has announced.