 Evidence emerged in the late 1990s of systematic slavery in cacao plantations in West Africa; see the chocolate and slavery article.According to the U.S. State Department, more than 109,000 children were working on cocoa farms alone in Ivory Coast in "the worst forms of child labour" in 2002.On the night of 14–15 April 2014, a group of militants attacked the Government Girls Secondary School in Chibok, Nigeria.