Why was Faisal Shahzad permitted to board a flight for Dubai some 24 hours after investigators of the Times Square terrorism case learned he might be connected to the attempted bombing?

Though Mr. Shahzad was stopped before he could fly away, there were at least two significant lapses in the security response of the government and the airline that allowed him to come close to making his escape, officials of the Department of Homeland Security, the Federal Bureau of Investigation and other agencies said on Tuesday.

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