While no one has taken credit for the bombing in the northeastern city of Yola, Nigerian officials say it's likely Boko Haram is responsible.
The terrorist organization has taken thousands of Nigerian lives, in addition to kidnapping hundreds of girls last year that brought on a worldwide campaign pleading "Bring back our girls." (Video via Vice News)
Days before the bombing, Nigerian President Muhammadu Buhari had visited Yola and declared Boko Haram nearly defeated. There's speculation his speech prompted the bombing.
According to the Global Terrorism Index for 2015, Boko Haram topped ISIS as the "deadliest terrorist group ... in 2014." Nigeria had a 300 percent increase in terrorist-related deaths, which was the largest increase across the globe.
This video includes images from Getty Images and Andrew Moore / CC BY SA 2.0.