Libya–United Kingdom relations soured in 2011 with the outbreak of the Libyan Civil War. Cameron condemned the "appalling and unacceptable" violence used against anti-Gaddafi protesters. After weeks of lobbying by the UK and its allies, on 17 March 2011 the United Nations Security Council approved a no-fly zone to prevent government forces loyal to Muammar Gaddafi from carrying out air attacks on anti-Gaddafi rebels. Two days later the UK and the United States fired more than 110 Tomahawk missiles at targets in Libya.