One person is dead and three others are missing after a boat with more than a dozen passengers aboard capsized and sank in San Francisco Bay near Alcatraz Island on Tuesday.

Axar.az reports, citing ABC News, authorities said they believe 20 people were aboard the Volare, a 50-foot cabin cruiser based out of Stockton, California, when it was hit by a wave, causing it to capsize.

The person who died was taken to the shore severely injured and, despite CPR being administered, was pronounced dead, officials said. He has not been identified but authorities said he was an adult male.

Three people were taken to the hospital and reported to be in stable condition. They were expected to be released later Tuesday.

San Francisco Fire Chief Dean Crispen told reporters that authorities believe that there was some kind of memorial service that the 20 passengers, all adults and mostly comprised of family members, were engaging in on the vessel when it capsized.

The U.S. Coast Guard will continue the search-and-rescue efforts for the three missing passengers overnight.