A rescue official says one man is dead and a local tour guide is missing after a boat capsized off Hout Bay near the western city of Cape Town.

Craig Lambinon of the National Sea Rescue Institute said there were 38 people onboard the charter boat Miroshga on Saturday, not 41 as previously assumed, and that there was one fatality. At least 24 of the survivors were hospitalized with serious or minor injuries.

It remains unclear what caused the boat to capsize near Duiker Island, which is popular with tourists hoping to see seals. Lambinon said maritime officials in South Africa were already investigating.

Most of the people on the boat were foreign nationals, and the deceased man was from the United Kingdom.