Four insurgent groups are active in north east Nigeria. The groups are categorised as Yusufiyya groups, a reference to their support and loyalty towards the former Boko Haram leader, Muhammed Yusuf: Boko Haram, Jamaa’atu Ahlis-Sunnah Ahlis-Sunnah Lid-Da’wati Wal-Jihaad, Ansorul-Muslimiina Fii Bilaadis-Sudan, Haraktul-Muhajiriina wal-Mujahidin.