The militant <a href="https://en.wikipedia.org/wiki/Nigeria" id="mwAbU" rel="mw:WikiLink" title="Nigeria">Nigerian</a> <a href="https://en.wikipedia.org/wiki/Islamism" id="mwAbY" rel="mw:WikiLink" title="Islamism">Islamist</a> group <a href="https://en.wikipedia.org/wiki/Boko_Haram" id="mwAbc" rel="mw:WikiLink" title="Boko Haram">Boko Haram</a> attacks a police station in <a href="https://en.wikipedia.org/wiki/Bauchi" id="mwAbg" rel="mw:WikiLink" title="Bauchi">Bauchi</a>, leading to reprisals by the <a href="https://en.wikipedia.org/wiki/Nigeria_Police_Force" id="mwAbk" rel="mw:WikiLink" title="Nigeria Police Force">Nigeria Police Force</a> and <a class="mw-redirect" href="https://en.wikipedia.org/wiki/2009_Boko_Haram_Uprising" id="mwAbo" rel="mw:WikiLink" title="2009 Boko Haram Uprising">four days of violence</a> across multiple cities.