The jihadists retook Palmyra in central Syria on December 11, just eight months after the army backed by Russia drove them out.
On Thursday, US-led coalition aircraft destroyed heavy weaponry seized by the jihadists when they retook the city, the coalition said.
A statement yesterday said the strikes destroyed an air defence artillery system, 14 tanks, three artillery systems, two IS-held buildings and two tactical vehicles.
Among the Russian weaponry IS captured around Palmyra were thought to be modern surface-to-air missiles, or SAMs, giving jihadists the potential capability to shoot down aircraft, a coalition official told AFP.
The strikes, near the Tiyas military air base northeast of Palmyra, helped regime forces gain some ground west of the fabled city, said the Observatory.
Palmyra is a UNESCO World Heritage site, and its recapture by IS gave the jihadists a propaganda boost as they face assaults on two of their key strongholds -- Raqa in Syria and Iraq's second city Mosul.
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