In Nigeria, at least 50 people have been killed in a suicide bombing in the north-eastern town of Mubi. <br/><br/>Police say, the mosque was packed with worshippers during morning prayers when the bomber struck. <br/><br/>Witness told AFP news agency that it appears the bomber was part of the congregation. <br/><br/>No-one has said they were behind the bombing. The militants of Boko Haram typically target crowded places in northern Nigeria.