The United States has foiled a plot by Al-Qaeda’s branch in Yemen to blow up a US-bound airliner near the first anniversary of Osama bin Laden’s death.

The United States has foiled a plot by Al-Qaeda's branch in Yemen to blow up a US-bound airliner near the first anniversary of Osama bin Laden's death, officials said Monday.

The FBI said investigators were examining the explosive that appeared to be a revamped model of the bomb employed in the Christmas Day plot of 2009, in which a plastic explosive hidden in a Nigerian man's clothes failed to detonate on a plane headed for Detroit.

The plot hatched by Al-Qaeda in the Arabian Peninsula was uncovered at an early stage and at no point was the public in danger, according to the White House and government agencies.

"The device was for use by a suicide bomber on an airliner," a US counterterrorism official told AFP on condition of anonymity.

"At no point were any airlines at risk."

News of the plot was revealed just days after the one-year anniversary of the raid by US Navy commandos that killed Al-Qaeda chief Osama bin Laden at his Pakistan hideout.

"I congratulate the CIA for thwarting this reported plot by AQAP to destroy a US-bound airliner using a specific type of bomb that is of new design and very difficult to detect by magnetometer," Senator Dianne Feinstein, who heads the Senate Intelligence Committee, said in a statement.

The FBI said the improvised explosive device was seized abroad and was "very similar to IEDs that have been used previously by Al-Qaeda in the Arabian Peninsula [AQAP] in attempted terrorist attacks, including against aircraft and for targeted assassinations."

Like previous attempted AQAP attacks, the explosive was non-metallic to avoid detection, officials said.

The latest conspiracy confirmed AQAP as a mounting danger that has gained ground due to unrest in Yemen, officials said.

"It is our assessment that the threat from AQAP is growing due to the territorial gains the group made during the political standoff in Yemen that lasted from early 2011 until this past February. Those territorial gains have allowed the group to establish additional training camps," the counterterrorism official said.