The Syrian Observatory for Human Rights said on Monday Islamic State killed at least 128 people in the Syrian town of al-Qaryatayn in central Homs over a three-week period before the Syrian army recaptured it on Saturday.
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There was no immediate comment from Syrian government officials or state media on the report.
Syrian activists reported that at least 65 bodies have been found in Qaryatayn, a central town in Homs retaken by government forces from ISIS. Most of the victims are believed to have been killed by ISIS.
The Britain-based Syrian Observatory for Human Rights says most of the dead were killed during the militant group's three-week seizure of the town.
Syrian troops and allied fighters regained control of the town on Saturday.
The activist-run Palmyra Coordination Committee has published the names of the killed. It says at least 35 of the victims were found shot and their bodies dumped in a shaft.
ISIS has suffered major setbacks in recent months.