Argentina has escalated the row over the ownership of the Falklands Islands as two British flag cruise ships were banned from calling at Ushuaia on Monday after they had called the Falklands earlier.

Princess Cruises 109,000 gross ton Star Princess and P&O Cruises 30,000 gross ton Adonia were both banned from calling at the Argentine port following an earlier visit at Port Stanley in the Falklands Islands, which belong to the UK. Princess Cruises and P&O Cruises are both parts of the Carnival Corp & plc group.

No explanation was given to the ban. Foreign & Commonwealth Office, the UK foreign ministry, said in a statement the ban was unacceptable interference with free commerce. Both ships in question are registered in Hamilton, Bermuda, a British overseas dependency. They fly the Red Ensign of the British merchant navy.