“My heart aches for the hundreds of boys and girls who have been kidnapped by Boko Haram over the years. No child should have to endure these atrocities,” she said.

She also said that the Chibok girls’ case shows that there’s still a lot of work to be done to ensure the advancement of gender equality worldwide.

“It’s the right thing to do, and it improves security and prosperity for everyone,” she said. “That starts with freeing the Chibok girls, and stopping the terror of Boko Haram,” she said.

The over 200 Chibok girls were abducted on April 14, 2014, and most of them remain in captivity.

Meanwhile, 15 of the girls have appeared in a video which was provided by Boko Haram to show proof of life.

The video, which was supposedly shot in December 2015, was obtained by CNN.

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Watch Chibok girls video below: