At least 20 people, mostly students, have been killed by unknown gunmen in Mubi, north-eastern Nigeria, a police source has told the BBC.
The attack happened at a student hostel away from the Federal Polytechnic Mubi campus, the source said.
A lecturer told the BBC that more than 40 students had been killed but there has been no official comment.
The reported killing comes days after a major operation against the Boko Haram militant group in the town.
Source: BBC
