Six others were in a serious condition following the attack at Bayero University campus where Christian worshippers were holding a service.
BBC: Deadly attack on Nigeria's Bayero university in Kano
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Britain's Foreign Office said it had received reports of an explosion and gunfire at Bayero University and that the incident may be ongoing.
CNN: Witness: Gunmen attack Nigeria university campus
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Emir al-Haji Ado Bayero - who is in his 80s - has been on the throne for almost 50 years and has been careful not to openly denounce the activities of the Islamist militants, he says.