The leader of the dreaded Islamic sect, Boko Haram had denied killing civilians in last week’s assault in Kano.
In a message posted on YouTube, The Boko haram leader, Abubakar Shekau blamed the deaths of “innocent civilians” on the security forces.
About 185 people died in the Kano bombings and gun attacks.
In his 40 minute audio message, Abubakar Shekau also threatened to carry out a bombing campaign against Nigeria’s secondary schools and universities – unless security forces stopped what he claimed was a series of recent attacks on Islamic schools or madrassas in the northern town of Maiduguri. The still picture posted on YouTube shows Mr Shekau dressed in a black turban and a white gown and bullet- proof vest – holding an AK 47 rifle.
He reiterated claims that the Nigerian government would not be able to stop Boko Haram and demanded the release from prison of all its members.
Boko Haram has acknowledged carrying out attacks on police and other government buildings.