The exchange was facilitated by Russian peacekeepers who have been deployed to Nagorno-Karabakh for five years under the peace deal.
Nigeria launched a crackdown on illegal religious schools and rehabilitation centres in late September. Nearly 1,500 people have been rescued since September.
David Allen Turpin and his wife Louise Anna who are accused of imprisoning their 13 children in the family's squalid home, pleaded not guilty to all charges.
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