US-born radical Islamist cleric Anwar al-Awlaki, a key al-Qaeda leader, has been killed in Yemen, the country's defence ministry said.
Unnamed US officials confirmed the reports, but have not provided details.
Awlaki, of Yemeni descent, has been on the run in Yemen since December 2007.
The US had named him a "specially designated global terrorist" for his alleged role in a number of attacks and US President Barack Obama is said to have personally ordered his killing.
The defence ministry statement said only that he died "along with some of his companions".
It gave no further details of his death.
But tribal sources told AFP news agency Awlaki was killed in an air strike in the eastern Marib province, said to be an al-Qaeda stronghold.