(CNN) -- President Obama on Saturday linked the man accused in a botched Christmas Day airline bombing to an al Qaeda affiliate based in Yemen.
The president pledged that everyone involved in the attack would be held accountable. He also highlighted his administration's attempts to crack down on extremist enclaves in Yemen, and reiterated his longstanding promise to "disrupt, dismantle and defeat" al Qaeda.
Obama has been criticized by some political opponents for not responding more aggressively to a botched December 25 attempt to blow up a Northwest Airlines passenger jet en route from Amsterdam, Netherlands, to Detroit, Michigan.
Umar Farouk AbdulMutallab is accused of trying to ignite explosives smuggled aboard the plane in his underwear. Obama confirmed Saturday that AbdulMutallab, 23, recently traveled to Yemen and "it appears that he joined an affiliate of al Qaeda."
Michael Leiter, director of the National Counterterrorism Center, said the attempted attack is a stark reminder of the threats the United States is still facing more than eight years after the September 11, 2001, attacks.
"While this attempt ended in failure, we know with absolute certainty that [al Qaeda] and those who support its ideology continue to refine their methods to test our defenses and pursue an attack on the homeland," Leiter said in a statement Saturday.
The group, al Qaeda in the Arabian Peninsula, apparently trained AbdulMutallab, "equipped him with ... explosives and directed him to attack that plane headed for America," Obama said.
"This is not the first time this group has targeted us," Obama said. "They have bombed Yemeni government facilities and Western hotels, restaurants and embassies, including our embassy in 2008.
"I've made it a priority to strengthen our partnership with the Yemeni government -- training and equipping their security forces, sharing intelligence and working with them to strike al Qaeda terrorists," he said.
Gen. David Petraeus, head of the U.S. Central Command, met with Yemeni President Ali Abdullah Saleh on Saturday in Yemen, according to a senior U.S. government source.
During the meeting, the source said, Saleh expressed his appreciation for U.S. help fighting extremists.
Saleh also offered more support for U.S. counterterrorism strikes and said he would continue providing assistance for the U.S. investigation into the attempted airline bombing.
British Prime Minister Gordon Brown called Friday for an international meeting later this month to discuss how to counter radicalization in Yemen.
Obama promised that "all those involved in the attempted act of terrorism on Christmas must know you, too, will be held to account," Obama said.
"Our nation is at war against a far-reaching network of violence and hatred, and ... we will do whatever it takes to defeat them and defend our country."
Obama, on vacation with his family in Hawaii, spoke with Homeland Security Assistant John Brennan on Thursday to review preliminary assessments of the federal government's inability to prevent the attempted airline attack.
AbdulMutallab had a valid, two-year, multiple-entry visa into the United States, despite the fact that his father had twice spoken to at least one representative of the CIA at the U.S. Embassy in Nigeria about his son's increasingly extremist views.
A report detailing that information was prepared but not circulated outside the agency, a source told CNN. Had that information been shared, AbdulMutallab might have been denied access to the flight, the source said.
The State Department announced Thursday it was directing American embassies around the world to include information on whether a person has a U.S. visa when they send special cables to Washington containing information on potentially suspicious individuals.
Obama also recently spoke with Homeland Security Secretary Janet Napolitano to receive an update on a federal review of "detection capabilities and ... enhanced security measures" put in place since the attempted bombing.
A new Transportation Security Administration directive requires airlines to physically pat down all passengers boarding planes bound for the United States and inspect their carry-on bags.
The directive also gives airlines the discretion to take other measures to prevent people from secretly assembling or igniting bombs on aircraft. Those measures include prohibiting people from keeping pillows or blankets on their laps during the final hour of a flight.