The Mubi bombing did not arrive in isolation. By mid-2014, Boko Haram had already killed nearly 4,000 people in Nigeria that year alone. In February, the group slaughtered more than 100 Christian men in the villages of Baga and Izghe in Borno State. That same month, 59 boys were killed in an attack on a federal college in Yobe State. In April, more than 200 schoolgirls were abducted from Chibok on the same day a bomb in Abuja killed at least 88 people. The Nigerian government had declared a state of emergency across three northeastern states in May 2013, but the resulting military crackdown failed to contain the insurgency. If anything, Boko Haram grew bolder. The group had expanded from attacking military targets and government buildings to striking at the everyday spaces where civilians gathered -- markets, churches, bus stations, and now football fields.

The bomb detonated within the crowd itself. Eyewitnesses described the blast coming from among the spectators as they crossed the field, suggesting the attack was the work of a suicide bomber. The tactic was becoming grimly familiar in northeastern Nigeria. Just the previous weekend, a similar attack had been attempted at a football field in Jos, though that bomber detonated prematurely before reaching the crowd. In Mubi, there was no such failure. The official death toll was initially reported as 18 with 19 injuries, though eyewitness accounts consistently placed the number of dead at 40 or higher. Eyewitnesses also reported seeing the suspected attacker's vehicle at the scene. The military surrounded the town in the hours that followed, searching for anyone connected to the bombing.

Mubi is a crossroads city near the Cameroon border, a place where traders and farmers from multiple ethnic groups converge. Football matches served as one of the few communal entertainments still possible in a region where daily life had been constricted by insurgent violence. The people killed at the Kabang field were not combatants. They were spectators -- fathers, brothers, young men, neighbors. Adamawa State Governor Murtala Nyako and the Speaker of the state House of Assembly, Ahmadu Umaru Fintiri, both condemned the attack as barbaric. Nyako called on citizens to remain calm and cooperate with investigators. But calm was a difficult ask in a state where bombings had become a feature of public life, where the question was never whether the next attack would come but where it would strike.

The Mubi bombing was one incident in a campaign of terror that consumed northeastern Nigeria for over a decade. Boko Haram, whose name roughly translates to "Western education is forbidden," had launched its insurgency in 2009 with attacks on police stations and government buildings. By 2014, it had evolved into a force capable of holding territory, kidnapping hundreds, and striking civilian targets with devastating regularity. The people of Mubi and towns like it bore the heaviest cost -- not the politicians in Abuja or the generals in their command posts, but the families who lost someone on a Sunday evening walk home from a football game. Their grief joined a tidal wave of loss across the region, where tens of thousands of lives have been cut short by the insurgency and the military response to it.