A plot by al-Qaeda in Yemen to detonate an upgraded version of the failed 2009 "underwear bomb" has been disrupted, US officials say.
The device was seized by intelligence operatives and is in US custody undergoing technical and forensic analysis, the FBI has said.
Reports said no target had been chosen and no plane tickets purchased by the time the alleged plot was foiled.
There is no indication on the status of the would-be bomber.
"As a result of close co-operation with our security and intelligence partners overseas, an improvised explosive device (IED) designed to carry out a terrorist attack has been seized abroad," the FBI said in a statement.
"Initial exploitation indicates that the device is 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," it added.
President Barack Obama was first informed of the plot in April, White House spokeswoman Caitlin Hayden said, adding that the device did not pose a threat to the public.
The BBC's Mark Mardell says that the plot, disrupted as a result of US co-operation with other unnamed intelligence agencies, appears to have been caught at a relatively early stage - after the making of the bomb but before the public was put at risk.
"What this incident makes clear is that this country has to continue to remain vigilant against those that would seek to attack this country. And we will do everything necessary to keep America safe," Defence Secretary Leon Panetta told reporters on Monday.
'Hallmarks'
It is not clear who built the device, but officials say it shares some features with the bomb sewn into the underwear of would-be suicide bomber Umar Farouk Abdulmutallab.
He was arrested when his device failed to explode fully while on a plane bound for Detroit on Christmas Day 2009.
It included a powerful industrial explosive and did not use metal, suggesting the bomb could have passed through airport security unnoticed, the Associated Press reports.
It is not clear whether body scanners, which operate in many US airports, would have been able to pick up the upgraded "underwear bomb".
Abdulmutallab's "underwear bomb" was not detected during security checks at airports in Lagos, Nigeria, and Amsterdam before he boarded Northwest Airlines Flight 253 for Detroit.
On the flight, the bomb did not detonate fully and passengers had to put out the fire. He has been sentenced to life in jail.
In a statement, the Department of Homeland Security said air security would continue to incorporate threat and vulnerability analysis, pre-screening and screening of passengers, as well as random searches at airports, air marshals and other unspecified security measures.
It added: "We have no specific, credible information regarding an active terrorist plot against the US at this time, although we continue to monitor efforts by al-Qaeda and its affiliates to carry out terrorist attacks, both in the homeland and abroad."
News of the operation emerged shortly after the US marked one year since the death of al-Qaeda leader Osama Bin Laden.
It also comes one day after Fahd al-Quso, a senior al-Qaeda leader in Yemen, was killed by a US drone strike.
The strike on Quso, which was reportedly carried out by the CIA with the authorisation of the Yemeni government, came after an extended surveillance operation.
The US had offered a $5m (£3.1m) reward for information leading to Quso's capture or death.
He was wanted in connection with the attack on the USS Cole in October 2000 while it was moored near the southern Yemeni port of Aden. The attack killed 17 US sailors and wounded 40.
The Yemeni government has stepped up its battle against AQAP since Ali Abdullah Saleh stepped down as president in November.
However, the group and its allies still control large parts of the country.
source: BBC
source: BBC
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