One person died and three others remained missing after a boat capsized near Alcatraz Island in San Francisco on Tuesday, authorities reported. The vessel, carrying approximately 20 adults—mostly members of the same family—was involved in a memorial service at the time of the incident.

The boat, described as having three decks, overturned close to the site of the former prison on the island. Emergency responders, including the local fire department, arrived promptly to conduct search and rescue operations.

Details about the cause of the capsizing have not yet been released. Rescue efforts continued into Wednesday as teams worked to locate the missing individuals. Officials have not provided updates on the condition of those who were rescued.

The incident highlights the potential hazards of maritime activities near the island, known for its strong currents and variable weather conditions. Investigations into the circumstances leading to the accident are ongoing.