After Yusuf was killed in 2009, Boko Haram’s new leader, Abubaker Shekau, increasingly turned to terrorist tactics. Since then, Boko Haram has become more and more violent. At one point, Boko Haram terrorized the north by using chainsaws to behead truck drivers who passed through their territory.
Boko Haram has had connections with various regional and global jihadist groups, including Al-Qaeda and its North African branch, AQIM. In 2015, Boko Haram pledged allegiance to Islamic State and renamed itself “The Islamic State of West Africa.” Seventeen months later, a major faction broke off under Abubaker Shekau. He continues to lead a slightly smaller Boko Haram.
While Boko Haram attacked mostly Christians and churches in the beginning, since 2015 they have attacked far more mosques than churches. Since 2014 the preferred method of attack has become suicide bombers, especially employing women bombers.
The number of people killed as a result of Boko Haram’s terror in Nigeria, Niger, Chad, and Cameroon exceeds 27,000. According to the UN, the violence has also displaced more than 2.5 million people and put more than seven million at risk of starvation.