Boko Haram insurgency insurgency spread to neighboring Cameroon, Chad, and Niger thus becoming a major regional conflict. In 2015, a coalition offensive forced Boko Haram to retreat into the Sambisa Forest. The insurgency took place within the context of long-standing issues of religious violence between Nigeria's Muslim and Christian communities. Boko Haram has been called the world's deadliest terrorist group, in terms of the number of people it has killed. Nigeria was amalgamated both the Northern and Southern protectorate in 1914, only about a decade after the defeat of the Sokoto Caliphate and other Islamic states by the British which were to constitute
Boko Haram to attack markets, transportation depots, mosques, and IDP camps. Boko Haram kidnapped 110 schoolgirls from the Government Technical Girls College in Dapchi, Yobe, on 19 February 2018. Boko Haram reportedly released all but one of the girls by 21 March. On 2 April, a Boko Haram attack on the outskirts of Maiduguri resulted in the death of 18 people and another 84 wounded. This attack came just days after the government of Nigeria claimed there was a ceasefire with Boko Haram. The attack happened in the villages of Bale Shuwa and Bale Kura, close to both Maiduguri and the city's