In 2014, Boko Haram drew international attention from its 14 April kidnapping of approximately 230 female students from a secondary school in the northern town of Chibok, Nigeria. Boko Haram leader Abubakar Shekau claims the girls have converted to Islam and has threatened to sell them as wives or slaves to Boko Haram members at a price of $12.50 each. Boko Haram has also attacked schools in Yobe State and forced hundreds of young men to join their forces, killing those who refused. Persistent violence in northeast Nigeria in 2014 has caused the deaths of over 2,500 civilians and the displacement of more than 700,000.