"The State Department issued a travel alert Sunday for American citizens in Europe in light of increased U.S. and European intelligence that a large-scale Al Qaeda attack may be imminent.

"Intelligence officials in the U.S. and Europe have said an increase in activity in recent weeks suggests that a small cell of potential terrorists hiding in North Waziristan, a Pakistani tribal region, is preparing an attack that could be as spectacular as the 2008 raids in Mumbai, India, that killed 166 people."

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