The Arab Spring caused the "biggest transformation of the Middle East since decolonization". By the end of February 2012, rulers had been forced from power in Tunisia, Egypt, Libya, and Yemen; civil uprisings had erupted in Bahrain and Syria; major protests had broken out in Algeria, Iraq, Jordan, Kuwait, Morocco, Oman, and Sudan; and minor protests had occurred in Mauritania, Saudi Arabia, Djibouti, Western Sahara, and Palestine. Tunisian President Zine El Abidine Ben Ali fled to Saudi Arabia on 14 January 2011 following the Tunisian Revolution protests. Egyptian President Hosni Mubarak resigned on 11 February 2011 after 18 days of massive protests, ending his 30-year presidency. The Libyan leader Muammar Gaddafi was overthrown on 23 August 2011, after the National Transitional Council (NTC) took control of Bab al-Azizia. He was killed on 20 October 2011 in his hometown of Sirte after the NTC took control of the city. Yemeni President Ali Abdullah Saleh signed the GCC power-transfer deal in which a presidential election was held, resulting in his successor Abdrabbuh Mansur Hadi formally replacing him as president on 27 February 2012 in exchange for immunity from prosecution. Weapons and Tuareg fighters returning from the Libyan Civil War stoked a simmering conflict in Mali that has been described as 'fallout' from the Arab Spring in North Africa.