New screenings for air travelers: President Obama promised to announce "further steps to disrupt attacks," in the coming days. He said changes would include better integration of information and enhanced passenger screening for air travel.

Review of watch-list system: A summary of the ongoing review of the terrorist watch-listing system will be made public "within the next few days."

Halt on transfer of Yemeni detainees: Obama also is suspending the transfer of Guantanamo prison detainees to Yemen but vowed to eventually close the camp.

Possible firings: Administration officials did not rule out the possibility of firings over the incident, although the president said he would not tolerate "finger-pointing" in the failures.

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