Four Nigerian schoolgirls kidnapped by the terrorist organization Boko Haram have escaped, according to Reuters.

Musa Inuwa, the education commissioner for Borno state – where the girls were abducted – made the announcement Wednesday, but gave no further details.

This leaves 219 still being held captive, according to Reuters; however, that number seems to be in flux. As recently as May 11, it was believed that 279 girls were still being held by Boko Haram.

After the initial capture, 53 girls escaped, while the rest were threatened with being sold into slavery. The Associated Press also reported that two girls had died from snakebites and 20 more had fallen ill, although nothing more has been written about that possibility.