The USS Bonhomme Richard, currently undergoing maintenance, has a crew size of about 1,000, Raney said.

At a press conference Sunday evening, Rear Adm. Philip Sobeck said the origin of the fire appeared to be in the lower cargo hold of the ship. It was unclear what caused the explosion, but that there is a \"low risk for secondary explosions,\" he said.

Authorities have cleared a 1,800-foot perimeter around the ship and are monitoring the temperature of the ship and the air quality, Sobeck said. The U.S. Coast Guard has also closed San Diego Channel south of Coronado Bridge to all boating traffic, he said.

Officials told ABC News it would likely be very hard to put the fire out. Local, base and shipboard firefighting teams were responding, officials said.

\"All in-port ships have been contacted and directed to provide fire parties to possibly assist with firefighting efforts,\" Raney said.

Multiple agencies at scene with SDFD - 3455 Senn St. working a military ship fire. #shipfire pic.twitter.com/9u9HqDUM32

— SDFD (@SDFD) July 12, 2020

Two firefighting teams were working on board the ship to contain the blaze, Federal Fire San Diego Division Chief Rob Bondurant said in a statement released late Sunday afternoon local time.

\"Federal Fire is rotating their crews aboard the ship with U.S. Navy firefighting crews from the waterfront to fight the fire in order to find the seat of the fire and extinguish it,\" he said, adding that Navy Region Southwest tug boats are also battling the fire from the water.

\"PHOTO:
Bing Guan/Reuters
PHOTO: Smoke rises from a fire on board the U.S. Navy amphibious assault ship USS Bonhomme Richard at Naval Base San Diego, Calif., July 12, 2020.
>

Two neighboring Navy ships -- the USS Fitzgerald and USS Russell -- have since moved away from the fire.

The origin of the fire is pending investigation.

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