In this undated photo released by the Syrian official news agency SANA, shows the site of the ancient city of Palmyra, Syria.

ISIS on Tuesday cut a key supply route between Syria’s Homs and the world heritage site of Palmyra just months after the army recaptured the ancient city, a monitor said.

ISIS “was able to cut the supply road between Homs and Palmyra near the Tayfur military airport after an attack launched from the east of Homs”, the Syrian Observatory for Human Rights said.

Both cities are controlled by the regime after troops recaptured Palmyra – a UNESCO world heritage site — from the extremist group in late March, backed by Russian air strikes.

Cutting the road “came as part of ISIS’s biggest assault since the army recaptured Palmyra with Russian support” on March 27, Observatory chief Rami Abdel Rahman said.

“Violent clashes between regime forces and Daesh are ongoing,” he said, using an Arabic acronym for the extremist group.

“Daesh surrounds Palmyra from all angles except in the southwest”, Abdel Rahman said, adding the closest ISIS was to the city was 10 kilometers.

ISIS and the regime both control parts of the area between Homs and Palmyra.

The road ISIS cut is “the main road between Homs and Palmyra but not the only one as there are other side roads” between both cities, Abdel Rahman said.

Syria’s civil war has killed more than 270,000 people and displaced millions since it started with anti-regime protests in 2011.

The Britain-based Observatory gathers its information from a wide network of sources inside Syria.

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