Nigeria marks four years since Chibok girls were kidnapped
It's been four years since Boko Haram kidnapped more than 270 schoolgirls in Nigeria. Around 100 remain missing. The abduction sparked global outrage and protests and the hashtag #bringbackourgirls. Washington Post global opinions editor Karen Attiah joins CBSN to talk about the movement and Nigeria's struggle to protect children from the terror group.