Since its early days Boko Haram has targeted the Muslim `` establishment '' in Nigeria . The group is also known for kidnapping and killing Christians, who are considered to be infidels by many Muslims. One eminent member of that establishment is the emir of Kano , Sanusi Lamido Sanusi , a former governor of Nigeria 's Central Bank who frequently preaches at the Kano mosque on Fridays . Boko Haram has stepped up suicide bombings , causing mass casualties . Friday 's attack at a mosque in Kano killed dozens , injured scores more .
Since its early days Boko Haram has targeted the Muslim `` establishment '' in Nigeria . The group is also known for kidnapping and killing Christians, who are considered to be infidels by many Muslims. Boko Haram has stepped up suicide bombings , causing mass casualties . Friday 's attack at a mosque in Kano killed dozens , injured scores more .