DAKAR, Senegal — Some of the young women are thriving at a new school. Some have returned home to their family farms. But the fates of more than 100 other students who were kidnapped from a school in northeastern Nigeria are unknown, five years after militants from Boko Haram abducted them.

On Sunday, the fifth anniversary of the kidnappings from the village of Chibok, President Muhammadu Buhari reiterated a pledge he had made years ago to bring back all of the students.

“We will not rest until all the remaining girls are back and reunited with their families,” he said on his official Twitter account. “I made this promise when I became President, and I will keep it.”

In 2014, Boko Haram militants stormed a girls’ school in Chibok and made off with over 200 girls who were boarding there to take exams the next day — an act that gained widespread attention across the world with the social media hashtag #BringBackOurGirls advocating their release.