An airstrike targeted a refugee camp in Syria’s northwestern province of Idlib Tuesday, injuring three children and a woman, according to a source with the Syrian civil defence group, the White Helmets.

Axar.az reports citing foreign media that the source, who requested to remain anonymous out of fear of reprisal, told Anadolu Agency (AA) that the attack targeted the Mariam refugee camp in the town of Maarrat Misrin, north of Idlib.

The source said the injured were hospitalized and the severity of their injuries has not yet been determined.

The Syrian opposition’s observatory said a Russian warplane took off on Tuesday from Khmeimim Airbase in Latakia province and struck the camp.