Last month boko haram attacked three churches in kaduna , a northern city that had been largely untouched by the insurgency , killing 21 and igniting four days of violence that left another 100-plus dead .
This appears to be what was happening yesterday . The north largely voted for the losing candidate , the former military ruler muhammadu buhari . Yesterday his supporters set fire to homes bearing ruling party banners in kano and there were reported to be numerous deaths in kaduna .