Syrian government troops and militia put up fierce resistance on Sunday to an ISIS assault on one of the jewels of the country's heritage, ancient Palmyra.

The fighting caused the death of nearly 300 people, a monitor said, according to AFP.



The Britain-based Syrian Observatory for Human Rights, which relies on a network of sources on the ground, said the toll comprised 123 soldiers and loyalist militiamen, 115 ISIS fighters and 57 civilians.



It said dozens of the civilians had been executed.



The Britain-based watchdog reported heavy artillery exchanges in the west of the town, close to the UNESCO-listed world heritage site.



But there were no immediate reports of damage to the ancient city's colonnaded street or its 1st and 2nd century temples.



ISIS was bringing up reinforcements from its stronghold in the Euphrates Valley to the east after sustaining heavy losses in its advance on the oasis town northeast of Damascus, provincial governor Talal Barazi told AFP.



The town's peacetime population of 70,000 has been swamped by an influx of civilians fleeing the ISIS advance.



"We are taking all necessary precautions, and we are working on securing humanitarian aid quickly in fear of mass fleeing from the city," Barazi said.



Syrian antiquities chief Mamoun Abdulkarim voiced extreme concern for the ancient site and its adjacent museum, in light of the destruction wreaked by ISIS on pre-Islamic sites like Nimrud and Hatra in neighboring Iraq.



"I am living in a state of terror," Abdulkarim told AFP, adding that ISIS "will blow everything up. They will destroy everything."



Last Update: Wednesday, 20 May 2020 KSA 09:47 - GMT 06:47