Boko Haram — properly Jama'atu Ahlis Sunna Lidda'awati wal-Jihad (JAS, 'People Committed to the Propagation of the Prophet's Teachings and Jihad') — was founded around 2002 in Maiduguri by Mohammed Yusuf, a charismatic young preacher of Kanuri-Shuwa origin trained in Saudi Arabia, who rejected Western education (boko, in Hausa loanword for English-style learning) as haram (forbidden).
Phase I (2002–2009) — Quietist Salafism: Yusuf built a community of several thousand followers around the Markaz mosque in Maiduguri, ran a network of religious schools and modest farms, and broke publicly with the Borno State government over what he called 'corrupt official Islam'. His sermons attacked the secular Nigerian state, the established Borno Emirate, the NPF and Western medicine, but the movement was unarmed and primarily oratorical.
Phase II (July 2009) — The Trigger: A minor traffic-rule confrontation between Yusuf's followers and Borno State police (over motorcycle helmets, ironically a piece of secular safety regulation) escalated into a five-day urban uprising across Maiduguri, Bauchi, Yobe and Kano. Joint Task Force operations killed an estimated 800 Yusuf followers. Yusuf was captured alive, paraded on camera to the press, and then extrajudicially executed in Borno State Police HQ on 30 July 2009. The execution video circulated globally and became the founding atrocity narrative of the militarised phase.
Phase III (2010–2014) — Insurgency: Under Abubakar Shekau, Yusuf's deputy, JAS reconstituted as a clandestine armed group, bombed the UN building in Abuja (26 August 2011), Madalla St Theresa Catholic Church (Christmas Day 2011), the THIS DAY office in Abuja, and progressively occupied LGAs across Borno, Yobe and Adamawa.
Phase IV (April 2014) — Chibok: On 14 April 2014, JAS fighters abducted 276 schoolgirls from Government Girls Secondary School Chibok, Borno State. The #BringBackOurGirls campaign — co-founded by Oby Ezekwesili and Hadiza Bala Usman — became the largest social-media protest in African history at that point and was a contributor to Goodluck Jonathan's 2015 electoral defeat. As of 2024, 96 of the original 276 girls remain unaccounted for.
Phase V (March 2015) — Bay'ah to ISIS & the Split: Shekau pledged allegiance to ISIS in March 2015. In August 2016 ISIS named Abu Musab al-Barnawi (son of Mohammed Yusuf) as the new wali of West Africa, splitting the movement. The al-Barnawi faction became Islamic State West Africa Province (ISWAP); Shekau retained the JAS rump. JAS focused on civilian terror and suicide bombings; ISWAP focused on military targets, taxation of civilian populations in occupied areas, and a deliberately less indiscriminate insurgent strategy.
Phase VI (May 2021 — present): Shekau killed himself with a suicide vest during an ISWAP assault on his Sambisa Forest headquarters in May 2021. JAS has since fragmented further. ISWAP has consolidated control of Lake Chad islands and remains the more dangerous of the two factions in 2026.
Total documented death toll across 2009–2024 is approximately 40,000 (ACLED, ICG). Displacement: 2.4 million IDPs in Borno, Yobe, Adamawa and across the Lake Chad Basin (UNHCR, 2024). The Multinational Joint Task Force (Nigeria, Chad, Niger, Cameroon, Benin) has operated since 2015. The structural drivers — Borno's economic collapse, demographic youth bulge, and the breakdown of traditional Borno Caliphate authority — remain unaddressed.