A gas pipeline explosion has ripped through a suburb of San Francisco, killing at least one person and destroying 53 homes.
The explosion in San Bruno sparked massive fires, which damaged anothers 120 houses.
Dozens are being treated at a south San Francisco hospital, a number of them with severe burns.
The blaze covers an area measuring forty thousand square metres, although authorities say it is being contained.
Firefighters have been battling the flames for most of the night and water-bombing aircraft have been called in to assist.
The ruptured pipeline belongs to Pacific Gas & Electric Co.
The company vowed to find out what caused the explosion.
The blast so close to San Francisco’s busy airport had initially sparked fears of terrorism, ahead of Saturday’s ninth anniversary of the September 11, 2001 attacks, but there is no suggestion of such a link.