The source gave no other details about the attack. It was the third bomb attack in Kano in just 24 hours.
On Sunday, a bomber hurled explosives at worshippers in a Catholic church, killing five and wounding eight. Also on Sunday, a female suicide bomber killed herself while trying to target police officers. Nobody else died in that attack.
There have been no claims of responsibility for any of the blasts, but the prime suspect is likely to be the Islamist militant group Boko Haram, which is fighting for an Islamic state in religiously-mixed Nigeria.
The militants have killed thousands since launching an uprising in 2009 and are seen as the gravest security threat to Africa's biggest economy and top oil producer.
Though much of the violence is concentrated in the remote northeast, they have struck across Nigeria in several bomb attacks since April. On Sunday, they mounted a cross-border attack into Cameroon, killing at least three people there and kidnapping the wife of the vice prime minister. REUTERS