
An undated picture released on the internet site of the Mubi Federal Polytechnic school shows the entrance of the premises in Mubi, northeast Nigeria.
Local sources say the attackers mainly targeted students who live in rented accommodation outside the campus of the Federal Polytechnic in Mubi.
The massacre is being blamed on Islamist extremist group Boko Haram, but officials say they do not rule out the possibility of political rivalry between college groups ahead of student union elections.
The town of Mubi is located in Nigeria's troubled northeast which has seen such violence previously, including January when gunmen killed at least 12 people.
Comment: Is the food shortage before us? Will we be buying bacon and pork sausages next year?