Syrian civilians and humanitarian organizations are searching prisons filled with prisoners, many of whom are political, after the sudden collapse of Syrian President Bashar Assad‘s brutal regime.

The regime subjected more than 130,000 people to arbitrary arrest and detention, according to a report in August by the Syrian Network for Human Rights, a nonprofit organization that began its tally when the civil war started in 2011. The arrests were carried out in secrecy, with families often left wondering what happened to their relatives.