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The US says it will temporarily ease passport rules imposed after 9/11 to avoid its citizens' summer travel being disrupted by a broken passport system.
US citizens flying to or from Canada, Mexico, the Caribbean or Bermuda will no longer need a passport as long as they prove they have applied for one.
Officials said the "record-breaking demand" at passport offices had led to excessive delays of up to three months.
The revised procedures will remain in place until 30 September.

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