A photo released by the U.S. Marshals Service on Monday shows 23-year-old… (U.S. Marshals Service )
Reporting from Washington — President Obama said Monday that the U.S. would press ahead with its offensive against terrorist cells worldwide, just minutes after an Al Qaeda-affiliated group in Yemen claimed responsibility for the airplane bombing attempt over Detroit on Christmas Day.
"This was a serious reminder of the dangers that we face and the nature of those who threaten our homeland," Obama said in his first comments about the incident aboard a Northwest Airlines flight from Amsterdam. "We do not yet have all the answers about this latest attempt, but those who would slaughter innocent men, women and children must know that the United States will do more than simply strengthen our defenses.
"We will continue to use every element of our national power to disrupt, to dismantle and defeat the violent extremists who threaten us -- whether they are from Afghanistan or Pakistan, Yemen or Somalia, or anywhere where they are plotting attacks."
Obama's remarks, delivered at a Marine base near his Hawaii vacation home, also marked the first time the administration had indicated it did not think Umar Farouk Abdulmutallab acted alone.
The 23-year-old Nigerian managed to smuggle a packet of highly explosive PETN aboard the flight, along with some liquid in a syringe that he used as a detonator, authorities said. After the explosives caught fire, he was overpowered by passengers and crew.
"We will not rest," Obama said, "until we find all who were involved and hold them accountable."
Also Monday, Homeland Security Secretary Janet Napolitano acknowledged that the suspect -- who had a valid U.S. visa -- had evaded measures meant to identify potentially dangerous travelers and detect explosives.
After discussions with the White House, Napolitano took to the airwaves to try to minimize criticism over remarks Sunday in which she said the security system had worked after the incident -- without dwelling on the failure to keep Abdulmutallab off the plane.
When asked Monday on NBC's "Today" show whether the system had "failed miserably," she answered: "It did."
"No one is happy. . . . An extensive review is underway," she said.
In his remarks, Obama outlined more aggressive security measures being taken, including enhanced screening and more federal air marshals on international flights. He said an investigation had been ordered to "determine just how the suspect was able to bring dangerous explosives aboard an aircraft and what additional steps we can take to thwart future attacks."
Even before Friday's attack, the United States -- in conjunction with the Yemeni government -- had stepped up its counter-terrorism operations in the country, seeking to combat a rapidly expanding Al Qaeda network there.
Abdulmutallab has told authorities that the terrorist organization trained him and provided the explosives.
The Yemeni foreign ministry confirmed Monday that Abdulmutallab visited several times -- ostensibly to study Arabic at a school in Sana, the capital -- including one trip from early August until early December of this year.
"Authorities are currently investigating who he was in contact with," the ministry said. But one Yemeni official said it might be hard to trace Abdulmutallab's steps, given how many students come from all over the world to study Arabic and Islam in the country.
Monday brought numerous developments, including a statement from the group Al Qaeda in the Arabian Peninsula claiming the would-be airline attack was retaliation for Yemeni airstrikes Thursday against suspected militants.
Anwar al Awlaki, a radical U.S.-born cleric, may have been killed in those strikes, although family members said he was alive. Awlaki had communicated with the accused gunman in last month's attack on Ft. Hood, Texas, that left 13 people dead.
In its communique, the Al Qaeda affiliate said Abdulmutallab had coordinated the plot with members of its group, using explosives they manufactured. The website posting was titled "The Brother Mujahid Omar Farooq al-Nigeri's Operation," and it included a photograph of a smiling Abdulmutallab in front of an Al Qaeda banner.
The statement also boasted that Abdulmutallab had "infiltrated all the advanced, new machines and technologies and the security boundaries in the world's airports . . . and he made all of what they spent on security development techniques a [new] heartbreak for them."
Acknowledging that the attack had not achieved its goal, the statement said, "We will continue on this path until we achieve success," according to a translation posted by the NEFA Foundation, an organization of counter-terrorism specialists.
A U.S. counter-terrorism consultant said the communique appeared to be authentic.
In Amsterdam on Monday, authorities said they were investigating whether an accomplice had helped Abdulmutallab board Flight 253 without a passport -- possibly by claiming he was a Sudanese refugee.
