Radical US-born cleric Anwar al-Awlaqi has been killed with several other suspected Al-Qaeda operatives, the Yemeni defense ministry said on Friday.

The ministry did not elaborate on the circumstances of Awlaqi's death in a statement released to the media.

But tribal sources told AFP that Awlaqi, who is wanted by Washington, was killed in an air strike which hit two vehicles in Marib province, an Al-Qaeda stronghold in eastern Yemen, early on Friday.