In early 2011, a civil war broke out in the context of the wider "Arab Spring". The 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 the government began to roll back the rebels and a number of atrocities were committed by both sides, a multinational coalition led by NATO forces intervened on 21 March 2011, ostensibly to protect civilians against attacks by the government's forces. Shortly thereafter, the International Criminal Court issued an arrest warrant against Gaddafi and his entourage on 27 June 2011. Gaddafi was ousted from power in the wake of the fall of Tripoli to the rebel forces on 20 August 2011, although pockets of resistance held by forces loyal to 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. His Jamahiriya regime came to an end the following month, culminating on 20 October 2011 with Sirte's capture, NATO airstrikes against Gaddafi's escape convoy, and his killing by rebel fighters.