"Instability in Yemen is a threat to regional stability and even global stability," Clinton today said at a joint press conference with Hamad Bin Jassim Jabr Al-Thani, Prime Minster and Foreign Minister of Qatar. "This is a difficult set of challenges but they have to be addressed."
Training and providing assistance to locals will be the key to fighting the war against terrorism but Americans shouldn't expect U.S. military action in Yemen, Washington Post reporter Bob Woodward said today,
"It's confusing, I think, to the average person," he said on "Good Morning America. "We've got these ground wars in Iraq and Afghanistan, but al Qaeda sanctuaries are in Pakistan, in places like Yemen, we don't have ground wars going on.
"The president there has taken a very aggressive stance in going after al Qaeda -- the key to this ground operations by other countries, quite frankly," Woodward told "GMA's" George Stephanopoulos.
And it is not only in Pakistan and Yemen where alleged terror groups are breeding.
"Somalia ... is another place of worry," Woodward said. "In fact, there are dozens of places of worry where there are al Qaeda cells around the world."
Obama, who cut his vacation short, plans to hold an inter-agency meeting Tuesday to discuss missed intelligence signals and security failures in the case of the 23-year-old Nigerian national who attempted to blow up a U.S.-bound airplane on Christmas day. Yemen and future security measures are also likely to be the subjects of discussion.
Officials, both in the United States and in Yemen, are trying to dig deep into the botched Christmas Day terror plot, where Umar Farouk Abdulmutallab, 23, tried to blow up a Detroit-bound plane with the explosive PETN strapped to his underwear.
In Yemen, officials are hoping to trace the steps of the Nigerian national who studied at an Arabic language institute there months ago.
Abdulmutallab lived on the third floor of a building, in a room with just a bed, a desk and a closet. A building guard told ABC News that Abdulmutallab only had a phone. A U.S. official told ABC News that he likely used Internet cafes to talk to al Qaeda.
The school's director Mohammad Al-Anisi told ABC News he believes that Abdulmutallab used Arabic studies as a cover, since his Arabic was already very good. Al-Anisi said although he came late to class, he was the best in the class.
Abdulmutallab ended up studying there with roughly 70 students from around the world. Classmates tell ABC News they were surprised when Abdulmutallab just disappeared in late September, and although Abdulmutallab was religious, he never struck them as an extremist.
"Sometimes we have students who are devout Muslims, male students would refuse to talk to or look at female students, and he wasn't like that," Linda Shen, a student from San Francisco, Calif., told ABC News.
"He definitely believed with all his heart in religion but there was nothing extreme, there was nothing fundamental about it," Canadian student Matthew Salmon said in an interview with ABC News.
But officials say as soon as Abdulmutallab left the language school, he met up with al Qaeda operatives who gave him training and the bomb with which he tried to blow up Northwest flight 253 on Christmas Day. It is that kind of training, officials fear, that other suicide bombers preparing for attacks have received.