NASSAU, Bahamas – Authorities in the Bahamas are trying to determine what caused a **** on a tour boat in an ******** that ****** a U.S. citizen and ******* nine people.

Royal Bahamas ****** Force Superintendent Shanta Knowles says officials from the country’s ******, **** and civil aviation departments were on the island of Great Exuma on Monday conducting an ************* into the ********* and ****.

Knowles says there were 12 people on board when the ******** occurred Saturday a few minutes into a day trip around the small islands near Great Exuma. Photos show the boat engulfed in smoky flames that forced the 10 U.S. citizens and two Bahamian crew members to jump *********.

The U.S. Coast Guard airlifted four Americans to ******* for treatment while six people were treated in Nassau.