Air strikes killed at least 11 people in rebel-held northwestern Syria on Sunday, the Syrian Observatory for Human Rights reported, and the Syrian state news agency said the army had repelled an attack by militants in the area.
In central Syria, state media also said that a train carrying phosphate was derailed by a bomb blast east of Palmyra, causing injuries among the crew.
It did not identify the perpetrators of the attack. Daesh terrorists are still active in central Syria.
The Observatory said the deaths increased the number of civilians killed by Syrian government or Russian bombardments in the northwest to 682 since late April. It said 53 civilians had been killed by rebel attacks on state-held areas in the same period.
Some 1,500 combatants on both sides have been killed in the same period, it said.
Meanwhile, Syrian state news agency SANA said the Syrian army had repelled an attack by militant groups who had targeted army positions protecting the village of al-Qasabiya in southern Idlib.