Story highlights More than 1.5 million people are displaced, including 800,000 children, UNICEF says

The kidnappings that inspired #BringBackOurGirls were a year ago this week

UNICEF is launching a #bringbackourchildhood campaign

(CNN) The abduction of more than 200 schoolgirls a year ago this week captured global attention and inspired the hashtag #BringBackOurGirls, but the horrors for Nigeria's children are widespread.

"Around 800,000 children have been forced to flee their homes as a result of the conflict in northeast Nigeria between Boko Haram, military forces and civilian self-defense groups," UNICEF said Monday.

The "number of children running for their lives within Nigeria, or crossing over the border to Chad, Niger and Cameroon, has more than doubled in just less than a year."

UNICEF released a report on the crisis titled " Missing Childhoods.

It also launched a social media campaign using the hashtag #bringbackourchildhood. The campaign has "leading Snapchat artists" sharing images based on drawings from children in Nigeria, Chad, Niger and Cameroon. Artwork can also be seen on Facebook, Twitter, Instagram and Tumblr

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