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