President Barack Obama's top counterterrorism adviser says there was "no smoking gun" that U.S. intelligence agencies should have found ahead of the alleged Christmas Day attack on a U.S. airliner.
The adviser, John Brennan, says there were a series of what he called lapses and errors in sharing intelligence about the Nigerian man accused in the foiled attempt.
Brennan is leading a White House review of the incident. Obama has said there was a systemic failure to prevent the attack.
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Brennan, speaking on "Fox News Sunday," didn't say whether anyone is in line to be fired because of the oversights.
Obama says an al-Qaida affiliate in Yemen apparently ordered the plot, training and arming the 23-year-old suspect.
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