LOS ANGELES, May 2 (Xinhua) -- Two people were killed and 23 others transported to hospitals after a vessel overturned Sunday off the coast of the U.S. city of San Diego, authorities said.

Multiple agencies including San Diego Lifeguards rescued 25 people from the water, said the San Diego Fire-Rescue Department on Twitter.

"Sadly, two did not survive. 23 were taken to local hospitals," the department tweeted, adding that U.S. federal agencies "are still searching the water in vessels and aircraft."

The incident was reported near 200 Catalina Boulevard around 10:30 a.m. local time, U.S. media reported, citing the department.

The vessel overturned in the waters off Point Loma, a rugged peninsula known for the Cabrillo National Monument, San Diego's only National Park.

Park officials said on Twitter after the incident that the tidepools of the park "are temporarily closed" and they "will post an update later today when the area reopens."

San Diego Mayor Todd Gloria said on Twitter that the city's firefighters, lifeguards, and police are assisting the U.S. Coast Guard and Port of San Diego Harbor Police in the rescue effort.

"I ask San Diegans to keep the boat's passengers in your prayers," he noted.

The details of the incident and the identities of the victims have not yet been made public by authorities. U.S. officials said they "will be updating the public later today."