A US-led air alliance has struck a Syrian army position in eastern Syria and has allowed the Islamic State terrorist militia to advance in the area, Damascus says.
The bombardment near a military airport in the province of Deir al-Zour has caused unspecified casualties and damage in the military hardware, the Syrian army said in a statement carried by the state news agency SANA.
"This bombardment clearly set the scene for a terrorist attack by Daesh on the position and controlling it," the statement says, using an Arabic acronym for Islamic State.
A fragile ceasefire in Syria brokered by the US and Russia that took effect on Monday has shown signs of crumbling as President Bashar al-Assad's forces and rebels groups have traded accusations of truce violations.
Russian President Vladimir Putin, a long-time ally of al-Assad, has suggested that the US wants to keep the ceasefire deal details secret in order to protect the combat potential of the US-backed opposition forces against the Syrian regime.