As the Islamic State’s attacks in Europe have captured the world’s attention, an ISIS-affiliated group has been waging an even deadlier campaign in Africa.

Hundreds killed when 20 attackers detonated coordinated blasts at police stations around a city. Fifty dead when suicide bombers, including women and children, attacked a market and camps housing people trying to escape the violence. Fifty Christians targeted and killed in a student housing area near a school.

These are a few of the hundreds of horrors wrought regularly by Boko Haram, an Islamist militant organization based in Nigeria, over the past six years.

[Boko Haram is forcing more children to carry out suicide bombings]

The group’s rise, some experts say, is attributable to government corruption and economic differences between the Muslim northern areas and more populous and prosperous Christian South.

While military forces have had some success regaining territory in the past year, Boko Haram continues to carry out attacks on civilians.