Smoke rises from a fire on board USS Bonhomme Richard at Naval Base San Diego, California.
Video footage showed thick black smoke billowing hundreds of feet into the air from several points along the 844-foot (257 m) amphibious assault ship docked at the San Diego Naval base.
Emergency crews in boats were alongside the burning ship, spraying it with hoses.
"Explosion with at least one injury at the USS Bonhomme Richard," the fire department wrote on Twitter.
Federal Fire called on San Diego Fire Rescue crews to respond to the three-alarm fire starting at around 9AM PT (4 PM GMT). All San Diego Fire Rescue responders were accounted for as of 11:19 AM (6:19 PM GMT), the department said on Twitter.
Around noon local time, the department said all its personnel had been instructed to exit the pier, while aerial video footage showed the blaze appeared to grow.
The cause of the blaze was not immediately apparent and the San Diego Fire Rescue Department did not immediately respond to a request for comment.
The fire, dubbed the Apple Fire by local firefighters — who routinely give blazes identifying names — was reported Friday in Cherry Valley, a community about 75 miles east of Los Angeles and had destroyed at least one family home as of Saturday evening.
More than 1,300 firefighters were battling a blaze that was burning out of control Sunday in southern California, threatening thousands of people and homes east of Los Angeles.
Residents fled their homes as the so-called Tick Fire scorched over 4,000 acres (1,618 hectares) and was only ten percent contained by Friday evening.
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