President Bola Tinubu says joint army, police and intelligence forces have freed dozens of students abducted from three schools in Oyo State and arrested eight militants.Spokesman Bayo Onanuga and Governor Seyi Makinde say some captors were killed, the kidnappers had demanded the release of a detained member, and officials deny any prisoner exchange.About 40 other pupils remain held after a separate abduction in Borno State, reviving fears after the 2014 Chibok kidnapping and recent mass kidnappings in Kebbi and Niger states.