The Islamic State (IS) terror group has moved more than 150 prisoners as an Arab-Kurdish coalition advances on its Syrian stronghold of Raqqa, a war monitoring group said on Friday.
According to the Syrian Observatory for Human Rights (SOHR), the captives were transferred from the al-Tabqa prison in Raqqa, located 450 km to the northeast of Damascus, Efe news reported.
A majority of the prisoners are Kurds captured in combat during clashes in the region.
The SOHR added that their new location was unknown, although a large number are believed to have been moved to the Maaden area.
The prisoner transfer comes as the IS is losing ground in the al-Tabqa area, where the Syrian Democratic Forces, a US-backed coalition made up of Kurds and Arabs, have taken the old citadel of Qalaat Jabaar.
Raqqa became the capital of the IS' self-proclaimed "caliphate" in June 2014.
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