One person is dead and two others are missing near Alcatraz Island in San Francisco Bay after a boat with 19 people aboard capsized Tuesday afternoon, officials said. A vessel was reported to be on fire around 600 yards off Alcatraz around 3:35 p.m., and police found a capsized three-deck pontoon boat, San Francisco Fire Chief Dean Crispen said. The incident was initially reported as a fire, but no first responders reported witnessing a blaze, Crispen said. Everyone on the boat is believed to have been adults, Crispen said. A dog was also on board and is dead, he said. Thirteen people were safely rescued, and another three were transported to hospitals, Crispen said. Firefighters are “in full rescue mode,” with 11 boats and divers as part of the response, Crispen said. “We are going to continue for hours to make sure that we find these two missing people, if possible,” Crispen said. “It seemed like a recreational-type vessel, but that’s all we know at this point,” Crispen told reporters. The vessel reportedly launched from a yacht club, and investigators were still gathering information, he said. Helicopter footage from NBC Bay Area showed responding rescue boats and debris floating in the water. Video from the station appeared to show some of the rescued with blankets on shore. Local police departments and private vessels also responded to the incident, Crispen said. “This is an all-hands-on-deck search and hopefully rescue,” San Francisco Mayor Daniel Lurie said. When first responders arrived, some people were in the water, others were on the sinking boat, and others were falling into the water, Crispen said. Alcatraz Island is the site of the famous prison located in San Francisco Bay, around 1 mile offshore. It was closed as a federal prison in 1963 and is now a National Park. Crispen said the search would be extensive. “Our standard operating procedure is to continue to search, as long as it’s safe enough for us to search,” he said. He said divers were in the water, helicopters were above, and officials were searching areas where survivors in the water would tend to move to. “This search will go on for some time,” Crispen said.