The radical Islamic group Boko Haram has freed 21 of the girls kidnapped from a school in the Nigerian town of Chibok which sparked the international #BringBackOurGirls campaign back in 2014. The BBC says that one of their sources informed them that the girls were freed as part of negotiations that also resulted in the government freeing militants, though officials in the country have denied this.
More than 270 were kidnapped, though 50 soon escaped. Most of the others are still missing and are believed to either have been forced into marriages with the terrorists or were sold into sex slavery.
