Dozens of IS fighters were also wounded in raids on weapons depots, barracks, and checkpoints at the terrorists capital of Raqqa, said Rami Abdel Rahman, director, UK-based Syrian Observatory for Human Rights.
France intensified air strikes on Raqqa, following 13 November’s attacks in Paris, with strike aircrafts carrying out dozens of raids between 15 to 17 November.
Russia also pounded Raqqa with long-range bombers and sea-launched missiles, after Kremlin confirmed a terrorist attack had sunk a Russian passenger jet over Sinai in October, killing 224 on board.
“The modest number of deaths can be explained by the fact that the terrorists had taken precautions,” said Abdel Rahman, who depends on a network of activists, medics and other sources inside Syria.
“There were only guards around the depots and barracks. Most of those killed were at the checkpoints,” he said.
He said, many families of foreign fighters had also left the city for Mosul in Iraq, another stronghold of IS, which has seized control of large parts of Syria and Iraq.