Yobe. IS militants also attacked a Nigerian Army convoy near Geidam, Yobe. The attack left two Nigerian soldiers dead. On 6 March, Boko Haram invaded Rumirgo community of Askira Uba local government area of Borno, killing two civilians and a security personnel and stole a tanker vehicle loaded with petrol. On 25 April, 31 Nigerian soldiers were killed in Mainok, Borno. On 19 – 20 May, ISWAP attacked and overran Boko Haram militants in the Sambisa Forest, Borno, and eventually captured the forest. The leader of Boko Haram Abubakar Shekau was killed during the fighting, reportedly using a suicide vest. The remaining Boko Haram loyalists rallied under Bakura Sahalaba who declared that they were not yet defeated. On 24 June, the United Nations Development Program released a report saying that the insurgency in Nigeria, as of the end of 2020, had killed around 350,000 people, by direct and indirect means. On 4 July, ISWAP named new commanders and governors, including personnel in charge of taxation. On 29 October it was reported that Nigeria's army it had killed the new leader of ISWAP, Malam Bako, in a military operation this month, two weeks after announcing the death of the group's former head Abu Musab al-Barnawi. On 6 November, non-IS sources claimed that ISWAP had elected Sani Shuwaram as new leading commander. On 13 November, Nigerian Army Brigadier General Dzarma Zirkusu and three other Nigerian soldiers were killed in an ISWAP attack on Askira town in Borno State. On 30 December, the Multinational Joint Task Force (MTJF) announced that six troops from Nigeria and Niger were killed and 16 wounded by ISWAP militants during an operation in December 2021 in Borno State. In the same operation, 22 militants were killed and 17 captured. 2022 On 18 February it was reported that Nigerian aircraft eliminated some terrorist kingpins including ISWAP Commander Mallam Buba Danfulani during a raid on Boko Haram/ISWAP terrorist's strongholds around the Tumbuns area in Lake Chad and Sambisa Forests surroundings. Five other commanders by the names of: Musa Amir Jaish, Mahd Maluma, Abu-Ubaida, Abu-Hamza and Abu-Nura umarun Leni were also killed. In May Abubakar Sarki a top Boko Haram leader and some of his troops were killed in the Sambisa Forest by the Nigerian army. On March 20 the new leader of ISWAP, Sani Shuwaram, and other terrorists were killed after airstrikes hit some terrorist camps. Shortly after reports emerged