Four passengers on four-day cruise from Miami found themselves behind bars at the end of the trip after authorities said they tried to use fraudulent credit cards in the ship’s casino.

According to arrest reports, the four suspects had been passengers on the MSC Magnifica, which left Miami on Aug. 19 on a trip with stops in the Bahamas.

During the trip, MSC security said the suspects had been attempting to “cash large amounts of money on board” by using fraudulent credit cards in the ship’s casino to pay slot machines and other casino games, the reports said.

Security contacted U.S. Customs and Border Protection, which found fraudulent activity related to the suspects’ booking of the cruise and financial transactions while on board the ship, the reports said.

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