FBI Investigating Woman's Death on a Carnival CruiseThe Federal Bureau of Investigation announced Sunday that it is looking into a 'suspicious death' in February on the Carnival Sunshine.

The Federal Bureau of Investigation (FBI) said it was an isolated incident and passengers weren't in danger. Yet, according to a statement issued Monday, the agency is investigating a woman's "suspicious" death during a cruise on the CarnivalSunshinebetweenSouth Carolinaand the Bahamas.

According to an FBI press release from the Columbia, South Carolina field office, on February 27,CarnivalSunshinestaff investigated a report of an unresponsive woman passenger. The woman was pronounced dead despite the efforts of crew members and medical staff.

CBS Newsreports that onSunshine's March 4 return to the U.S., the FBI boarded and investigated the cabin where the woman was found. Carnival is reportedly cooperating in the investigation, which is also under scrutiny by authorities in theBahamas. The FBI noted in its release that it typically investigates "certain crimes on the high seas," which can include an American's death in questionable circumstances.

TheFBIcan investigate many serious crimes on the high seas, including piracy, terrorism, hijacking, and drug trafficking. Still, the agency's authority to investigate is limited to certain types of offenses and situations and is subject to various legal and practical limitations.

Hannah Hierholzer, who said she was a passenger on the same cruise, toldCharleston TV station WCSCthat there were several calls over the ship's intercom for a medical response team. She said she thought, "'Oh, that's weird, maybe that happens all the time,' because there's old people on cruises with a health problem or something."

CNNquoted Carnival spokesperson Matt Lupoli, who said in part that "the deceased and her husband were debarked in Nassau and Bahamian authorities have already investigated the circumstances and are conducting an autopsy." Otherwise, he said that Carnival is "fully cooperating."

"This is a matter for authorities in the Bahamas and Charleston," Lupoli stated, "and we have no further comments."