The Africa Regional Manager for International Christian Concern (ICC) is asking U.S. citizens to contact their Congressional representatives on Leah Sharibu’s behalf.

Leah, 15, was captured along with over 100 classmates in February from an all-girls school in Dapchi, Nigeria. Boko Haram released the rest of the girls in March. But they kept Leah captive for refusing to renounce Christ. She was the only Christian among the schoolgirls.

In August, Boko Haram released an audio recording of Leah begging for assistance from the Nigerian government. Earlier this month, they threatened to kill her.