"Many arrests have been made since the attacks," the police source said in relation last Friday's attacks that killed at least 185 people.
"We have arrested around 200 attackers and 80 per cent of them are Chadians. They came in as mercenaries."
The source alleged there had been indications the Chadians were paid to participate in the attacks attributed to Islamist group Boko Haram.
However, Nigerian authorities have come under immense pressure over the spiralling violence blamed on the Islamists and have in the past been accused of rounding up innocent civilians in response to attacks.
According to the source, suspected members of Boko Haram have reached out to the police for potential talks, with the emir of Kano as mediator. The emir is the most important traditional leader in Kano.
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