President Barack Obama this morning convened a secure conference call with Homeland Security and Counter-terrorism adviser John Brennan and National Security Staff Chief of Staff Denis McDonough in which he received an update on heightened air travel safety measures in the wake of yesterday's attempted bombing of a Northwest Airlines flight headed to Detroit.

In a media statement regarding the 6:20 a.m. briefing, White House deputy spokesperson Bill Burton said Obama will continue to "actively monitor the situation."

The Los Angeles Times reported that federal officials said a Nigerian passenger attempted to ignite an incendiary device aboard a Northwest Airlines flight from Amsterdam to Detroit yesterday as the plane began its approach for landing. Other passengers overpowered the man and the plane landed safely.

The suspect, identified as Abdul Mutallab, 23, suffered severe burns as a result of the attempt, authorities said, and two of the other 277 passengers reported minor injuries.

FBI agents were investigating the incident, which a White House official said was an attempted act of terrorism.

"He was trying to ignite some kind of incendiary device," said a federal anti-terrorism official, who requested anonymity because of the sensitivity of the case. "He lit himself on fire and he's suffered some burns."

The device, which mixed powder and liquid, was said to be less powerful than a bomb.

The suspect — an engineering student at University College of London, according to ABC News and NBC News — began his trip Thursday from Nigeria. It was not clear Friday whether Mutallab underwent security screening in Amsterdam or merely changed planes there.

It also was uncertain Friday night whether the suspect had ties to a terrorist organization or had attempted the attack on his own, authorities said. Despite earlier reports that he had claimed a connection to Al Qaeda, Mutallab denied any such link in later statements to FBI agents interrogating him, the anti-terrorism official said.

"Right now he is saying he was not part of an organization or a coordinated effort. I want to caution people from jumping headlong into the Al Qaeda link because it's a very murky area," the official said.

The suspect smuggled a powder aboard the plane in a container taped to his leg, the official said.

Covering himself with a blanket to hide his actions, he used a syringe to inject a liquid into the powder, and a fire resulted from the combustible mix, according to the official, who did not identify the materials.

The official denied reports that Mutallab had been on the federal "no-fly" list of suspected extremists and other potentially dangerous individuals, which is shared with airlines. But the official did not rule out the possibility that the Nigerian had been on some other U.S. government database.

Various media reports spelled the suspect's name different ways. The Associated Press gave his full name as Umar Farouk Abdul Mutallab.

The Northwest jet, an Airbus 330 with Delta markings, landed about noon local time. (The two airlines merged in April 2008.) It carried a crew of 11.

Those aboard described some panic after noises like firecrackers, then quick, heroic actions.

Syed Jafri, a U.S. citizen who had flown from the United Arab Emirates, said the incident occurred during the plane's descent, according to the Associated Press. Jafri said he was seated three rows behind the passenger and said he saw a glow and smelled smoke. Then, he said, "a young man behind me jumped on him."

"Next thing you know, there was a lot of panic," Jafri said.

Peter Smith, another passenger, told WJBK Fox 2 in Detroit that one man saw the flames and leaped across the aisle to help extinguish them. "He jumped over all the other people and he took care of it, so the fire went out," Smith said.

The heroic passengers were not publicly identified Friday.

Iliaa Schelke, another passenger, told the station: "We heard a loud pop and a bit of a smoke and then some flames and yelling and screaming. And then somebody said the guy was subdued and they took him out. It was really quick."