The Libyan crisis refers to the ongoing conflict in Libya, beginning with the Arab Spring protests of 2011, which led to the First Libyan Civil War, foreign military intervention, and the ousting and death of Muammar Gaddafi. The civil war's aftermath led to violence and instability across the country, which erupted into renewed civil war in 2014. The ongoing crisis in Libya has so far resulted in tens of thousands of casualties since the onset of violence in early 2011. During both civil wars, the output of Libya's economically crucial oil industry collapsed to a small fraction of its usual level, with most facilities blockaded or damaged by rival groups. U.S. President Barack Obama admitted on 11 April 2016 that not preparing for a post-Gaddafi Libya was probably the "worst mistake" of his presidency.