Attacks in Saudi Arabia may be imminent: UK

The unusually strong-worded statement followed the cancellation of a British Airways flight from London to the Saudi capital, Riyadh, on Monday, which was called off last week due to unspecified security fears.

"Following terrorist attacks in Riyadh in May and November 2003, we believe that terrorists remain determined to carry out further attacks in Saudi Arabia and that these may be in the final stages of preparation," the Foreign Office said on its website.

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"We advise British nationals against all but essential travel to Saudi Arabia," it said in updated travel advice for the country.