In early 2011, a civil war broke out in the context of the wider "Arab Spring". The rebel anti-Gaddafi forces formed a committee named the National Transitional Council on 27 February 2011. It was meant to act as an interim authority in the rebel-controlled areas. After killings by government forces in addition to those by the rebel forces, a multinational coalition led by NATO forces intervened on 21 March 2011 in support of the rebels. The International Criminal Court issued an arrest warrant against Gaddafi and his entourage on 27 June 2011. Gaddafi's government was overthrown in the wake of the fall of Tripoli to the rebel forces on 20 August 2011, although pockets of resistance held by forces in support of Gaddafi's government held out for another two months, especially in Gaddafi's hometown of Sirte, which he declared the new capital of Libya on 1 September 2011. The fall of the last remaining cities under pro-Gaddafi control and Sirte's capture on 20 October 2011, followed by the subsequent murder of Gaddafi, marked the end of the Libyan Arab Jamahiriya.