A boat explosion at a South Florida marina has killed one person and injured five others, officials said.

The explosion happened Monday night at the Lauderdale Marina, the Fort Lauderdale Fire Department said in a social media post.

Rescuers transported five people to local hospitals, three of them with traumatic injuries, officials said. A sixth person was found dead in the water several hours later by the Broward Sheriff’s Office.

Fire and rescue officials said they did not immediately know what caused the explosion.