Amnesty International charged in a report Tuesday that Greek police often use violence against demonstrators, migrants and detained suspects.
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Sandara Farouq Kadouda was released on 15 April. She had been abducted on 12 April by a group of men in civilian clothes, believed to belong to the National Intelligence Security Service (NISS).
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Since 2014, Boko Haram has killed at least 5,500 Nigerian civilians and abducted at least 2,000 women and girls, many of whom been forced into sexual slavery and trained to fight.