The U.S. Coast Guard is searching for a passenger who reportedly went overboard from a Carnival cruise ship about 35 miles south of the Florida Keys. “Sadly, all the facts surrounding this unfortunate incident indicate it was an intentional act,” a Carnival spokesman said Friday. “We remain hopeful that the U.S. Coast Guard effort will bring positive news.” The cruise ship was on its way back to dock in Miami after four days at sea when the 26-year-old man went missing. “All appropriate authorities, including the United States Coast Guard, were notified, and the ship has joined in the search and rescue efforts,” Vance Gulliksen, a spokesman for Carnival cruises, said in a statement.