SANAA/ADEN - At least 10 suspected militants were killed in air strikes in southern Yemen on Thursday, and authorities reinforced security at foreign missions and government sites in Sanaa over warnings of a possible al-Qaida attack in the capital.A local official in southern Abyan province, partly controlled by an al-Qaida-linked group, said Yemeni warplanes launched two strikes at Islamist targets in the village of Umm al-Jabalayn, near the militant stronghold city of Jaar.The official said at least 10 militants were killed in the attack. Jaar residents said they saw members of the group, Ansar al-Sharia, bringing bodies back to the city for burial.In a text message, a group which identified itself as Ansar al-Sharia denied any of its militants were killed in the strike.The reported strike is near an area where Ansar al-Sharia last week said it killed at least 20 Yemeni soldiers.