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Witnesses said they heard what sounded like a dog in the cargo area before the man responded and asked for water.
Officials are investigating a man they say allegedly stowed away on a flight from Havana to Miami that landed early Friday.
Investigators from U.S Customs and Border Protection say the 26-year-old Cuban man was in the baggage cargo area of the Swift Airlines flight that landed at Miami International Airport just after midnight.
A ramp agent encountered the man while offloading baggage, officials said.
Witnesses said they heard what sounded like a dog in the cargo area before the man responded, saying he was not a dog and asked for water.
Officials have not released additional details about the man involved or his identity, but say he was denied entry into the country and was processed as a stowaway.