The war has prompted a considerable number of the country's sizeable foreign labour force to leave the country as extremist groups such as ISIL have targeted them; prior to the 2011, the Egyptian Ministry of Labour estimated that there were two million Egyptians working in the country yet since the escalation of attacks on Egyptian labourers the Egyptian Foreign Ministry estimates more than 800,000 Egyptians have left the country to return to Egypt.[184] Land mines remain a persistent threat in the country as numerous militias, especially ISIL, have made heavy use of land mines and other hidden explosives; the rapidly changing front lines has meant many of these devices remain in areas out of active combat zones; civilians remain the primary casualties inflicted by land mines with mines alone killing 145 people and wounding another 1,465 according to the International Committee of the Red Cross (ICRC).[185][186]