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The new security directives came into effect on Monday. But the BBC's Jane O'Brien in Washington says it is unclear whether a pat-down could have found the device investigators say the alleged would-be bomber, 23-year-old Umar Farouk Abdulmutallab,

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The US has introduced tougher screening rules for passengers arriving by air from 14 nations which the authorities deem to be a security risk. Travellers from Nigeria, Pakistan, Syria, Iran, Sudan, Yemen and Cuba will be among those facing body pat-down

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Also on Sunday, both the US and Britain closed their embassies in Yemen, citing security threats. John Brennan, the US deputy national security adviser, said an al-Qaeda offshoot had "several hundred members" in Yemen. Last week, a Yemen-based

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As part of the new guidelines, passengers travelling from any other foreign country will also be checked at random. The main suspect in the alleged airliner plot is Nigerian, and Yemen-based militants have said they trained and equipped him. Hours after