A real dropped ball on Christmas Day Bombing Attempt

This sounds about as serious of a warning as one can get.

The accused "underwear bomber" made a dramatic final call to his father that he found so alarming, the father approached Nigerian officials who took him directly to the CIA's station chief in the Nigerian capital, sources told ABC News.

Current and former officials of the Nigerian government, including a source close to the suspect's family, say Umar Farouk Abdulmutallab, 23, called his father from Yemen with the warning that it would be his last contact.

It has previously been reported that the man's father, prominent Nigerian banker Alhaji Umaru Mutallab, went to Nigerian and American officials Nov. 19 to warn them that his son had been radicalized by Islamic militants in Yemen.

Details have emerged about Abdulmutallab's final phone call that highlight President Obama's statement that there were "systemic failures" of the country's security system.

ABC News' sources said that during Abdulmutallab's final call, he told his father the call would be his last contact with the family. He said that the people he was with in Yemen were about to destroy his SIM card, rendering his phone unusable. . . .