It's not yet known why a cruise boat capsized in calm water off the coast of Bahrain last night.

Officials say 57 people are dead, 67 were rescued, and 13 are missing.

Bahrain television reports that the owners of the vessel say it might have been overloaded, and flipped when most of the passengers moved to one side.

One survivor tells The Associated Press that "people were having fun, but the boat was very crowded."

He said that once in the water, people were scared and "were fighting with each other and screaming."

Officials say the ship's captain survived and is being interrogated.

A Navy official says an American civilian working for a U.S. Navy base is among the survivors.