A spokesperson for the Cameroon government confirmed that 900 hostages held by Boko Haram were freed by a multinational force of troops. The force killed 100 and arrested an additional 100 involved in the hostage situation.

The New York Times reports that hostages from Cameroon, Nigeria, and Chad were being held in camps with the intention of being trained for roles as suicide bombers and fighters. The sweep, in which the hostages were freed, was carried out from Nov. 27 to Nov. 29. The forces consisted of troops from Cameroon, Nigeria, Chad, and Benin.

Among the 100 arrested was a leader for the Boko Haram stronghold in the Sambisa Forest, between Cameroon and Nigeria. The freed hostages are being reunited with their respective families. Trauma care is being offered to girls and women that may have been used as sex slaves.

Troops have rescued numerous hostages and captives from Boko Haram, none of whom have been the 219 schoolgirls kidnapped from a school in April 2014. The kidnapping drew national attention and outrage, as many decried the Nigerian government for not being able to save the girls.

Boko Haram has been responsible for the deaths of at least 20,000 people, and has driven over 2 million people from their homes, sources say. The group’s attacks have terrorized Cameroon, Chad, and Niger, over the course of six years. The affected countries have since banded together by sending troops to a centralized force, designed to eliminate Boko Haram’s threat in the region.