The police in northeast Nigeria's Bauchi State on Wednesday said 721 inmates of the prison that was attacked by suspected extremist Muslim group, Boko-Haram were set free by the attackers.

Gunmen on Tuesday stormed a federal prison in northern Nigeria's Bauchi State where members of an extremist Muslim group were held. Authorities said the attack was aimed at setting free some of their members awaiting trial following last year's religious crisis which claimed many lives and properties.