Boko Haram emerged in Maiduguri under Mohammed Yusuf, who was killed in police custody in July 2009. Under Abubakar Shekau the group bombed the UN building Abuja (Aug 2011), Police HQ Abuja (June 2011), and many churches and markets. On 14 April 2014 the group abducted 276 girls from Government Secondary School Chibok; #BringBackOurGirls became a global movement co-convened by Oby Ezekwesili. The insurgency spawned ISWAP after 2016. As of 2024, of the original 276 Chibok girls, 91 are still unaccounted for.
Figure 1
Boko Haram / ISWAP-linked fatalities, 2009–2024
The 2014–2015 peak made Boko Haram the world's deadliest terror group by GTI ranking. Fragmentation after Shekau's death in 2021 reduced totals without ending the insurgency.
Source: ACLED Africa dataset 2024; Global Terrorism Index 2024; Nigeria Security Tracker (CFR).