SANAA - A top leader of al-Qaida's Yemen wing has been killed during a dispute with his brother, Yemeni officials said on Thursday.Tareq al-Dahab, a relative of slain US-born cleric Anwar al-Awlaki who led an assault on the town of Radda last month, died in his stronghold in al-Baidah province early on Thursday, they said."Dahab was killed by his brother at his residence in the al-Manasih neighborhood in al-Baidah province during a family dispute," a security official told Reuters.