A suicide bomb has exploded at the Kano State Polytechnic, Kano State, and there are casualties, witnesses say.

Kano State Police Public Relations Officer, Magaji Majiya, confirmed that the bomb explosion took place at the Central Administration building of the polytechnic.

The explosion occurred as students queued to check their names on a new admission list, they added.

Bodies lay strewn at the blast site, witnesses told the BBC.

The bomber was hidden in the crowd, a witness, Isyaku Adamu, told the AFP news agency.

The BBC’s Yusuf Ibrahim Yakasai in Kano says police have not yet confirmed the blast.

The number of people killed or wounded is still unclear.