Two men, including an intelligence officer, were shot dead as they left a mosque in the southern Yemeni port city of Aden on Friday, in an Al-Qaeda revenge attack, tribal sources said.
A member of the Assal tribe from Abyan province to which the victims belonged said the attack took place in the central district of Darim.
"Al-Qaeda wants revenge against our tribe for having driven them out of the town of Mudia," he said.
A medic at the city's Sadek hospital where the bodies were taken said the two men had been shot dead.
Al-Qaeda is strong in Abyan province, north of Aden, and has controlled its capital of Zinjibar since May 2011. But the Assal tribe drove them out of Mudia.