Boko Haram

====Uprising====
{{Further|2009 Boko Haram uprising}}
In 2009, police began an investigation into the group, code-named Operation Flush.{{citation needed|date=August 2021}} On 26 July, security forces arrested nine Boko Haram members and confiscated weapons and bomb-making equipment. Either this or a clash with police during a funeral procession led to revenge attacks on police and widespread rioting in [[Bauchi]], Maiduguri, [[Potiskum]] in [[Yobe State]] and [[Wudil]] in [[Kano State]]. A joint military task force operation was launched in response. By 30 July, more than 700 people had been killed; [[police station]]s, [[Nigerian Prisons Service|prisons]], government offices, schools and churches had been destroyed.<ref name=enc/><ref name=journals/>{{rp|98–102}}<ref name="Nigeria: Boko Haram 101">{{cite web |author=Joe Bavier |url=http://pulitzercenter.org/reporting/nigeria-boko-haram-terrorist-group-islam-christian-church-targets-youth-military |title=Nigeria: Boko Haram 101 |website=Pulitzercenter.org |date=15 January 2012 |access-date=9 March 2012 |archive-date=23 August 2015 |archive-url=https://web.archive.org/web/20150823110758/http://pulitzercenter.org/reporting/nigeria-boko-haram-terrorist-group-islam-christian-church-targets-youth-military |url-status=dead }}</ref><ref name=NOSSITER>{{cite news|url=https://www.nytimes.com/2009/07/28/world/africa/28nigeria.html?scp=6&sq=nigeria&st=cse |title=Scores Die as Fighters Battle Nigerian Police|last=Nossiter|first=Adam |date=27 July 2009 |newspaper=[[The New York Times]] |access-date=22 January 2012}}</ref> Yusuf was arrested, and died in custody "while trying to escape". As had been the case decades earlier in the wake of the 1980 Kano riots, the killing of the leader of an extremist group would have unintended consequences. He was succeeded by [[Abubakar Shekau]], formerly his second-in-command.<ref>{{cite news |url=http://news.bbc.co.uk/1/hi/8177451.stm |title=Nigeria sect head dies in custody |publisher=[[BBC News]] |date=31 July 2009 |access-date=31 July 2014}}</ref><ref>{{cite news |url=http://english.aljazeera.net/news/africa/2010/02/20102102505798741.html |title=Nigeria killings caught on video – Africa |publisher=[[Al Jazeera English|Al Jazeera]] English |date=10 February 2010 }}</ref>