A Carnival Cruise Lines ship is stuck at port in St. Maarten in the Caribbean with equipment trouble.
Last month, 4,200 people aboard another Carnival ship were stranded for almost five days, after a fire in its engine room.
Passengers on the Triumph described "hellish" conditions including being forced to sleep in tents on deck and due to limited food being reduced to eating cold onion sandwiches.
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The unexploded bomb was found near the Houses of Parliament and led to disruption in central London overnight.
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Police said the incident in Melbourne, Australia, was terror related.