The suspect claimed to have received training and instructions from al-Qaida operatives in Yemen, a law enforcement official said on the condition of anonymity because the investigation is ongoing.
Aides to President Barack Obama are pondering how terror watch lists are used after the botched attack, according to officials who described the discussions Saturday on the condition of anonymity so as not to pre-empt possible official announcements.
Rep. Jane Harman, D-Calif., chairman of a House Homeland Security subcommittee, said there were "strong suggestions of a Yemen-al Qaida connection and an intent to blow up the plane over U.S. airspace." Several officials said they have yet to see independent confirmation.
Some airline passengers traveling Saturday felt the consequences of the frightening Christmas Day attack. They were told that new U.S. regulations prevented them from leaving their seats beginning an hour before landing.
The Justice Department charged that Umar Farouk Abdulmutallab (OO-mahr fah-ROOK ahb-DOOL-moo-TAH-lahb) willfully attempted to destroy or wreck an aircraft; and that he placed a destructive device in the plane.
U.S. District Judge Paul Borman read Abdulmutallab the charges in a conference room at the University of Michigan Medical Center in Ann Arbor, Mich. where he is being treated for burns.
An affidavit said he had a device containing a high explosive attached to his body. The affidavit said that as Northwest Flight 253 descended toward Detroit Metropolitan Airport, Abdulmutallab set off the device - sparking a fire instead of an explosion.
According to the affidavit filed in U.S. District Court in Detroit, a preliminary analysis of the device showed it contained PETN, a high explosive also known as pentaerythritol.
This was the same material convicted shoe bomber Richard Reid used when he tried to destroy a trans-Atlantic flight in 2001 with explosives hidden in his shoes.
PETN is often used in military explosives and found inside blasting caps. But terrorists like it because it's small and powerful.
FBI agents recovered what appeared to be the remnants of a liquid-filled syringe, believed to have been part of the explosive device, from the vicinity of Abdulmutallab's seat.
U.S. authorities told The Associated Press that in November, his father went to the U.S. embassy in Abuja, Nigeria, to discuss his concerns about his son's religious beliefs.
One government official said the father did not have any specific information that would put his son on the "no-fly list" or on the list for additional security checks at the airport.
Nor was the information sufficient to revoke his visa to visit the United States. His visa had been granted June 2008 and was valid through June 2010. Officials spoke on condition of anonymity because neither was authorized to speak to the media.
The suspect smiled when he was wheeled into the hospital conference room. He had a bandage on his left thumb and right wrist, and part of the skin on the thumb was burned off.
He was wearing a light green hospital robe and blue hospital socks. The judge sat at the far end of a 10-foot table, the suspect at the other end.
Judge Borman asked the defendant if he was pronouncing his name correctly.
Abdulmutallab responded, in English. "Yes, that's fine." The judge asked Abdulmutallab if he understood the charges against him. He responded in English: "Yes, I do."
The judge said the suspect would be assigned a public defender and set a detention hearing for Jan. 8. The hearing lasted 20 minutes.
Attorney General Eric Holder made clear that the United States will look beyond Abdulmutallab. He vowed to "use all measures available to our government to ensure that anyone responsible for this attempted attack is brought to justice."
Abdulmutallab was in a terrorism database but not on a no-fly list. He lived in a posh London neighborhood.
President Barack Obama, on vacation in Hawaii, was briefed about developments in the attack. National Security Council chief of staff Denis McDonough was holed up in a secure hotel room in Hawaii to receive briefings, and other traveling presidential aides were kept shut away to monitor new information.
Several members of Congress called for congressional investigations.
Abdulmutallab appeared on the Terrorist Identities Datamart Environment database maintained by the U.S. National Counterterrorism Center, said a U.S. official who received a briefing. Containing some 550,000 names, the database includes people with known or suspected ties to a terrorist organization.
However, it is not a list that would prohibit a person from boarding a U.S.-bound airplane. His name was added to the database in Novembers, according to an administration official who spoke on condition of anonymity to discuss the investigation that is ongoing.
In Nigeria, Alhaji Umaru Mutallab, the man's father, told The Associated Press, "I believe he might have been to Yemen, but we are investigating to determine that."
Rep. Adam Smith, D-Wash., said there are still questions about the suspect's connections with al-Qaida and Yemen.
Still, Smith noted that incendiary materials used by Abdulmutallab suggest he may have had more formal instruction and aid than a self-starter moved to action by militant al-Qaida ideology. Smith is chairman of the House Armed Services subcommittee on terrorism and has been briefed on the investigation.
U.S. Intelligence officials say their investigation is pointing in that direction, but they are still running down his claims. The officials spoke on condition of anonymity to discuss the investigation.
A Virginia-based group that monitors militant messages called attention Saturday to a Dec. 21 video recording from an al-Qaida operative in Yemen who warned of a looming bombing in the U.S. IntelCenter said the al-Qaida member levied that threat last week during a funeral for militants killed during an airstrike in Yemen two days earlier.
The father was chairman of First Bank of Nigeria from 1999 through this month. The banker said his son is a former university student in London but had left Britain to travel abroad.
A search was conducted Saturday at an apartment building in the West London neighborhood where the suspect is said to have lived.
University College London issued a statement saying a student named Umar Farouk Abdulmutallab studied mechanical engineering there between September 2005 and June 2008. But the college said it wasn't certain the student was the same person who was on the plane.
Larry Margasak reported from Washington. Associated Press writers Eileen Sullivan, Pam Hess, Lita Baldor, Matthew Lee and Devlin Barrett in Washington, and Philip Elliott in Hawaii contributed to this report.
AP source: US knew of terror suspect
By EILEEN SULLIVAN and DEVLIN BARRETT
Associated Press Writers
The person accused of the attack on a Detroit-bound airliner had been added to a government list of people with terror ties in November.
Umar Farouk Abdulmutallab's name was added to a list that includes names of people with known or supsected contact or ties to a terrorist or terrorist organization. Around the same time, the suspect's father went to U.S. embassy officials in Nigeria with concerns about his son's religious beliefs.
The suspect's name, however, had come to the attention of intelligence officials many months before that, according to a U.S. official involved in the investigation. The official spoke on condition of anonymity because it is an ongoing investigation.
The man's name was added to the Terrorist Identities Datamart Environment list in November. It is maintained by the U.S. National Counterterrorism Center and includes about 550,000 names.
People on that list are not necessarily on the no-fly list and Rep. Peter King, R-N.Y., said Abdulmutallab was not on that no-fly list.
King, the ranking Republican on the House Homeland Security Committee, said no federal air marshals were on the flights from Nigeria to Amsterdam and from Amsterdam to Detroit. Abdulmutallab did not go through full-body image screening at either airport, the congressman said.
Rep. Bennie Thompson, D-Miss., the chairman of the House Homeland Security Committee, said Mutallab would have been re-screened at the Amsterdam airport after his flight from Nigeria. Thompson and others say the Amsterdam airport has long had a good reputation for security.
Thompson said he plans to hold a hearing in January about the incident.
"It's still safe to fly," Thompson said.