There have been a number of IED attacks in Kano on 27 July, with some fatalities, to coincide with the Eid weekend.
There is a high threat from terrorism. In the past few weeks there have been explosive attacks in Damaturu, Kano, Jos, Kaduna, Abuja and Lagos, with multiple casualties. You should avoid public places where crowds gather. A heavy security presence often indicates areas of particularly high risk.