of a plot to attack the American and British embassies, and other western targets in Abuja. The DSS also later announced that between 25 and 26 March, five suspected members of Boko Haram had been arrested, thus thwarting the plot. On 2 April, the Nigerian military began what it said was its "final offensive" to retake Boko Haram's last strongholds. On 17 May, the Nigerian Army reported that it had arrested about 126 suspected Boko Haram terrorists at the Internally Displaced Persons (IDPs) camp in Damboa, Borno. In September, Boko Haram militants kidnapped about 40 young adults, women and children and killed 18 in the town of Banki, 130 km southeast of Maiduguri, Borno State, on the border of Nigeria and Cameroon. Boko Haram was reported to have killed 380 people between April and September in the Lake Chad area . About 57% of all schools in Borno state were closed due to the Boko Haram insurgency, affecting the education of about 3 million children. On 21 November, a suicide bomber killed 50 people in a mosque in Mubi. In December, fighters who were believed to belong to ISWAP attacked a patrol of US Army Special Forces and Nigerian soldiers in the Lake Chad Basin Region in Niger. The coalition troops managed to repel the assault without suffering any casualties. 2018 On 16 February, three suicide bombers killed about 20 people in Konduga. On 19 February, Boko Haram kidnapped 110 schoolgirls from Dapchi, Yobe. By March, two main insurgent factions were still active, and continued to wage an insurgency campaign against the government: The followers of Abubakar Shekau (Boko Haram) operated mainly in southern Borno, while the faction of Abu Musab al-Barnawi (ISWAP) was mostly located around Lake Chad. On 26 April, Boko Haram bombers killed at least four civilians in the outskirts of Maiduguri, the largest city in Borno. A subsequent gun battle and tear gas launched by security forces repelled the attackers, but left two officers wounded and several others injured. On 1 May, two suicide bombers killed dozens of people in Mubi. On 15 July, hundreds of Nigerian soldiers went missing after ISWAP forces led by Abu Musab al-Barnawi overran a Nigerian Army base in the northeastern part of Nigeria. Less than 100 Nigerian soldiers returned after the attack, the attack came 24 hours after ISIL ambushed a military convoy in neighbouring Borno. The attack on the