An air strike carried out by the US-led coalition in Syria is reported to have targeted regime forces for the first time, killing at least three soldiers and destroying a number of vehicles.

The Syrian government said four warplanes bombed its Saega military camp in Deir al-Zor province, describing it as an "act of aggression" by coalition forces.

According to the Syrian Observatory for Human Rights monitoring group, 13 more military personnel were wounded in the strike, which it said took place near the town of Ayyash on Sunday evening.

But while the Syrian foreign ministry said in a statement that it had written to the UN over the incident, a spokesman for the coalition denied it had carried out any air strikes on the area in question.

The US-led coalition has been bombing the largely Isis-held region of Deir al-Zor since it began its campaign against the militant group.

But if confirmed, Sunday's attack would be the first time a coalition bombing raid had, accidentally or otherwise, targeted the forces of Syrian President Bashar al-Assad.

The Syrian foreign ministry said: "The Syrian Arab Republic strongly condemns this flagrant aggression by the US-led coalition forces, which blatantly violates the objectives of the UN Charter."

It urged the UN to take "immediate action and take the necessary measures to prevent a repeat" of the incident.

British jets prepare for air strikes in Syria Show all 10 1 /10 British jets prepare for air strikes in Syria British jets prepare for air strikes in Syria A Tornado jet takes off from RAF Lossiemouth in Scotland, as RAF Tornado jets carried out the first British bombing runs over Syria British jets prepare for air strikes in Syria Pilots and ground crew prepare combat aircraft Panavia Tornados at RAF Marham at RAF Marham, UK Getty British jets prepare for air strikes in Syria A Eurofighter Typhoon jet takes off from RAF Lossiemouth in Scotland, as RAF Tornado jets carried out the first British bombing runs over Syria British jets prepare for air strikes in Syria A RAF Tornado arrives at RAF Akrotiri to begin operations in Akrotiri British jets prepare for air strikes in Syria A Tornado jet ahead of taking off from RAF Lossiemouth in Scotland, as RAF Tornado jets carried out the first British bombing runs over Syria, the Ministry of Defence has confirmed. The air strikes were carried out within hours of a vote by MPs in the Commons to back extending operations against Isis from neighbouring Iraq British jets prepare for air strikes in Syria Personnel work on a British Tornado after it returned from a mission at RAF Akrotiri in southern Cyprus British jets prepare for air strikes in Syria Two RAF Tornado GR4's, both with remaining weapons ordnance, approach RAF Akrotiri in Cyprus, as they return to the base after carrying out some of the first British bombing runs over Syria British jets prepare for air strikes in Syria A RAF Tornado takes off from RAF Akrotiri, on the Mediterranean island nation of Cyprus British jets prepare for air strikes in Syria A Tornado jet leaving RAF Lossiemouth in Scotland British jets prepare for air strikes in Syria AKA RAF Tornado arrives at RAF Akrotiri to begin operations in Akrotiri, Cyprus. The RAF has sent two further Tornado aircraft and six Typhoons to bolster aircraft now flying sorties to both Iraq and Syria

Speaking to the AFP News Agency, however, Col Steve Warren at the joint coalition command centre said the allied forces' only strikes in Deir al-Zour on Sunday were more than 30 miles away from the camp named in monitoring reports.

"We've seen those Syrian reports but we did not conduct any strikes in that part of Deir al-Zour yesterday," he said. "So we see no evidence."

He did not provide comment on reports from the Observatory that a second coalition strike on Sunday destroyed a building in Deir al-Zor city itself, killing a woman and two children.

An eastern province in Syria, Deir al-Zor represents a key link for Isis between its Raqqa stronghold and territories in Iraq.