Following the release of 21 out of over 200 schoolgirls kidnapped in 2014 from their school in Nigeria, a faction of the militant group Boko Haram may be willing to free more.

Reuters reports that, according to a spokesperson for Nigeria’s president, the same Boko Haram faction that negotiated the first release last Thursday is holding 83 other kidnapped schoolgirls.

“The faction said it is ready to negotiate if the government is willing to sit down with them,” Garba Shehu told Reuters, saying that the Nigerian government is ready to negotiate the release of the girls.

Allegations that captured Boko Haram fighters were swapped for the freedom of the 21 girls freed last week were denied by a Nigerian minister, according to the report.

The girls were part of a group of over 200 abducted by Boko Haram in April 2014 from their school in Chibok, Nigeria, when militants attacked their school during the night.

The mass abduction sparked a global outrage and a call to action at that time, centered around the hashtag #BringBackOurGirls.

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