Members of the Daesh terrorist group have 'executed' 19 civilians including two children in a village in eastern Syria, the Syrian Observatory for Human Rights said Saturday.

"Daesh fighters entered Jazrat al-Boushams village on Friday evening and executed 19 civilians, including two women and two children, with bullets to the head before torching the corpses," Rami Abdel Rahman of the Britain-based monitor told AFP.

"Some were rounded up in the street before being killed, and others were executed at home," said the head of the Observatory, which gathers its information from a large network of sources across the war-torn country.

Jazrat al-Boushams village is in Deir Ezzor province, which is largely controlled by the terrorists.

It was captured by the SDF when alliance fighters first entered the region earlier this year.

The village is also near the neighboring province of Raqqa, which Daesh mostly controls.

Despite being pressed militarily on all sides in Syria, the terrorist group retains an ability to carry out murderous attacks.

On Thursday, Daesh killed more than 50 people in an assault on two regime-held villages in central Syria's Hama province.

A day later, U.S. Defence Secretary Jim Mattis said President Donald Trump had instructed the Pentagon to "annihilate" Daesh in Syria in a bid to prevent escaped foreign fighters from returning home.