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Officials in Yemen were investigating whether Abdulmutallab spent time with al-Qaida militants there during the months leading up to the botched bombing attack.
They also said he was not openly extremist, though he expressed anger over Israel's actions against Palestinians in Gaza.
Officials also noted Tuesday that Amsterdam, where Abdulmutallab boarded his flight to Detroit, is one of nine locations where US Customs and Border Protection officials are stationed to do additional screening on US-bound passengers who have been flagged as a potential risk.
But it is unlikely Abdulmutallab would have been flagged because the Customs and Border Patrol officers do not routinely screen all passengers against the names of individuals on the Terrorist Identities Datamart Environment database, known as TIDE, which was the only place that Abdulmutallab was listed.
The government put in place enhanced screening procedures for passengers after the September 11, 2001, attacks on New York and Washington to catch potential terrorists. On US-bound flights from overseas, CBP checks passenger names against some lists of potential terrorists, but not against all information the government keeps.
On top of that, airport security equipment did not detect the bomb-making devices and materials Abdulmutallab is accused of carrying on board the Northwest Airlines flight.
Obama said many things went right after the incident, with passengers and the flight crew subduing the man and government officials working quickly to increase security. He singled out Napolitano, backing her much-criticized comments that the attempted terror attack showed the aviation security system worked.
"As Secretary Napolitano has said, once the suspect attempted to take down Flight 253, after his attempt, it's clear that passengers and crew, our homeland security systems, and our aviation security took all appropriate actions," Obama said.
Napolitano received so much criticism for her Sunday talk show remarks that she did another round of interviews the following day to say the system did not work in preventing Abdulmutallab from getting on the plane with a bomb. But, she said, the response system did work after the man was subdued. She contends her remarks were taken out of context.
Meanwhile, Napolitano asked to meet with security and counterterrorism experts, including at least two former Bush administration officials, according to a person familiar with the meetings. On Tuesday, she met with former Bush homeland security adviser Fran Townsend and former DHS undersecretary for policy Stewart Baker, said the person, who spoke on condition of anonymity because the meeting was not on the secretary's public schedule.
Republicans are questioning Napolitano's judgment and a few have called for her resignation. The White House says her job is safe.
However, Obama said: "What's also clear is this: When our government has information on a known extremist and that information is not shared and acted upon as it should have been ... a systemic failure has occurred. And I consider that totally unacceptable."
The two reviews, which Obama said got under way on Sunday, are looking at airport security procedures and the US system of terror watch lists..
"It now appears that weeks ago this information was passed to a component of our intelligence community but was not effectively distributed so as to get the suspect's name on a no-fly list," Obama said.