Security's ramped up in America where an unconfirmed but credible terror threat's been received ahead of the 10th anniversary of the 9/11 attacks.

Intelligence indicates al-Qaida's planning to use car bombs to blow up bridges or tunnels in New York or Washington.

Former Security Minister Pauline Neville-Jones says she still has concerns about terror threats - ten years on from the 9/11 attacks.

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