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CHARLESTON, S.C. – The Federal Bureau of Investigations in Columbia, South Carolina, is investigating the death of a woman last week on a Carnival cruise ship that was heading from Charleston, South Carolina to Nassau, Bahamas.

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The FBI Columbia field office said on Feb. 27, Carnival’s Sunshine crew members as well as medical staff had responded to an unresponsive woman on board, in a news release obtained by CBS News. She was pronounced dead on the ship.

Carnival Cruise Line spokesperson Matt Lupoli told CNN in a statement that the woman and her husband were “debarked in Nassau and Bahamian authorities have already investigated the circumstances and are conducting an autopsy.” Lupoli said they are also cooperating with both the FBI and authorities in the Bahamas.

Once the ship returned to Charleston, South Carolina on March 4, officials with the FBI searched the couple’s room for evidence, CBS News said.

The FBI said the incident seems to be isolated and there was no threat to others on the cruise, CNN reported.

“The FBI investigates certain crimes on the high seas, as well as suspicious deaths of U.S. persons,” FBI spokesperson Kevin Wheeler said in a statement obtained by WCSC.

The FBI said the incident remains under investigation. The woman’s cause and manner of death have not been released.