Gunmen in Nigeria's northern Kaduna state kidnapped eight secondary school students coming from school along with an unknown number of others, authorities said on Tuesday, the latest in a wave of such abductions.

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Kidnappers who raided a boarding school in northern Nigeria earlier this month released 28 children on Sunday (July 25) but another 81 remain in captivity, according to a pastor involved in the negotiations for their release. The attack on the Bethel Baptist High School in the state of Kaduna was the 10th mass school kidnapping since December in northwest Nigeria carried out by Islamist militants and more recently, criminal gangs.