The interim government in Libya said it has custody of Saadi Gaddafi, a son of the late Libyan dictator Moammar Gaddafi. The government made the announcement in a message on Facebook that thanked the president of neighboring Niger for his cooperation, CNN reported. Saadi Gaddaf fled to Niger, where he was granted asylum after an uprising ousted his father from power. During the uprising, he made an offer to negotiate with the rebels and sounded prepared to cut loose his father and one of his brothers, Saif al-Islam Gaddafi, often assumed to be his father's heir apparent. Saif al-Islam Gaddafi was captured by rebel forces during the uprising. Two more of Moammar Gaddafi's sons were killed during the rebellion. Saif al-Arab Gaddafi died in a NATO airstrike in spring 2011 and Khamis Gaddafi was killed in a battle in Northwestern Libya that August, rebel commanders said. Around the time of his death, troops commanded by Khamis Gaddafi killed an estimated 150 captive civilians, during a retreat, hurling grenades and spraying bullets into a building full of men they had promised to release, a survivor said. A further son, Mutassim Gaddafi, died in October 2011. The former dictator's wife Safia fled with sons Mohammed, Hannibal and daughter Aisha to neighboring Algeria in late August 2011, along with extended family members. They reportedly left there for Oman, where they were granted asylum.