Anwar Al-Awlaki, a US-born cleric linked to Al-Qaeda's Yemen-based wing, has been killed, Yemen's Defence Ministry said on Friday.
"The terrorist Anwar Al-Awlaki has been killed along with some of his companions," it said in a statement sent by text message to journalists, but gave no details.
A Yemeni security official said Awlaki, who is of Yemeni descent, was hit in an air raid and said those killed with him were suspected Al-Qaeda members.
It was not immediately clear if Yemeni forces had carried out the raid or if Awlaki had been killed by a US drone strike. A US drone aircraft targeted but missed Alwaki in May.
US officials were not immediately available for comment.
Awlaki had been implicated in a botched attempt by Al-Qaeda in the Arabian Peninsula (AQAP) to bomb a US-bound plane in 2009. US authorities have branded him a "global terrorist" but Sanaa had previously appeared reluctant to act against him.
Eloquent in English and Arabic, Awlaki encouraged attacks on the United States and was seen as a man who could draw in more Al-Qaeda recruits from Western countries.