Troops in Nigeria have arrested 158 suspected members of the Boko Haram organisation in dawn raids in the northern city of Kano.
Boko Haram carried out a series of bombings in Kano on Friday in which at least 185 people died.
The group wants to overthrow the government and impose Islamic law.
Attacks by Boko Haram killed at least 500 people last year, according to Amnesty and Human Rights Watch.
