A huge explosion killed the governor of Yemen's southern Aden province and six of his bodyguards Sunday, security officials said. The attack was later claimed by a local affiliate of the Islamic State in Iraq and the Levant (ISIL). Gov. Gaafar Mohamed Saad was traveling to his office when the explosion struck his convoy in the southern port city. Authorities are investigating the exact cause of the explosion. The officials spoke on condition of anonymity because they were not authorized to brief the media.