Four people are dead and 11 were rescued after a small vessel capsized in waters off Miami early Wednesday, and rescuers were trying to determine whether anyone else needed to be saved, a U.S. Coast Guard spokeswoman said.

The vessel capsized just after 1 a.m. about 7 miles off the channel that ships use to pass Miami Beach into the Port of Miami, Coast Guard spokeswoman Sabrina Laberdesque said.

The Coast Guard would not comment on the names and nationalities of those aboard, or the vessel's destination and point of departure.

The 11 rescued were found clinging to the capsized craft, the Coast Guard said. Among them, one was airlifted to a hospital; their conditions were not released.

Those who died were found in the water, the Coast Guard said.

The Coast Guard said it was searching for any other passengers who might be in the water Wednesday morning.