21 rescued Chibok girls were exchanged for four Boko Haram prisoners

Nigeria's presidency has confirmed the release of 21 Chibok girls kidnapped by Boko Haram Islamists in 2014. And also said the Chibok girls were exchanged for four Boko Haram prisoners in Banki.

"The release of the girls...is the outcome of negotiations between the administration and the Boko Haram brokered by the International Red Cross and the Swiss government," a presidency statement said. "The negotiations will continue."

Around 270 girls were taken from their school in Chibok in April 2014. Dozens escaped in the initial melee, but more than 200 are still missing.