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Some 25 people, mostly students, have been killed by unknown gunmen in Mubi, north-eastern Nigeria, police say. Twenty-two of the dead were students whom attackers had called out by name, a police spokesman told the BBC. A local resident said at least 40 people had been shot dead or stabbed. The killings come days after a major operation against the Boko Haram militant group in the town, while others have linked them to a dispute over student union elections. Rivalries over student elections have turned violent before but have never reached this level, says the BBC's Nigeria correspondent Will Ross. Mobile phone masts in the area were recently attacked by Boko Haram militants, so getting information from Mubi is difficult, adds our correspondent.