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DETROIT - The U.S. government tightened airline security as it searches for answers to how a 23-year-old Nigerian man eluded extensive systems intended to prevent attacks like his botched Christmas Day effort to blow up a Northwest flight from overseas.

WASHINGTON - The alleged Christmas Day terrorist had been in one of the U.S.

WASHINGTON - Travellers to the US from abroad were advised Saturday to allot extra time for check-in as Washington upped the security requirements to board a US-bound plane.

DETROIT - A 23-year-old Nigerian man who claimed ties to al-Qaida was charged Saturday with trying to destroy a Detroit-bound airliner, just a month after his father warned U.S.