The Voice of America
reports that many of the victims were police or soldiers.
Earlier witnesses told Reuters
that the bombing left windows shattered with firefighters trying to douse the flames billowing out of the roof damaged building.
, a reporter with Lagos based private television-Channels TV, was shot dead while covering the multiple bomb attacks that also affected an immigration office.
According to the Voice of America, a spokesman for Boko Haram told newsmen that the co-ordinated bombings were in retaliation for the arrest of several sect members in Kano.
The leader of the Islamist sect Boko Haram who wants Sharia law to be applied across Nigeria's north had described recent killings of Christians as justifiable revenge attacks
, saying President Goodluck Jonathan had no power to stop the group's insurgency.