(Reuters) - Two suspected al Qaeda militants were killed on Monday in a drone strike on their vehicle south of the capital Sanaa, tribal and government sources said.

The strike follows another on Saturday in which at least four militants were killed in Abyan governorate, in southern Yemen. A Yemeni official did not say who was behind the attack, but previous strikes have been carried out by the United States.

Monday's strike occurred at dawn in the Radda area in al-Bayda province, but the sources gave no further details and Washington does not usually comment on drone strikes.