The London-based Syrian Observatory for Human Rights (SOHR) documented Daesh or the so-called Islamic state militants use of gas during its shelling that targeted the village of Rajm al- Tfihi located in the south of Tal Brak town in the province of al- Hasakah in 28 June, according to doctors’ testimony and analyses.

SOHR knew that the shelling by gas caused vomiting, suffocation and eye-burn suffered by 12 Kurdish People's Protection Units (YPG) fighters. The doctors’ testimonies and laboratory analysis confirmed that Daesh used gas in its shelling on the village; it is unknown whether the gas used during bombardment is chlorine or another kind of gas. Information also reported to SOHR that Daesh used gas when they targeted the neighborhood of al- Salhiyyah in the city of al- Hasakah.

SOHR demanded UN Security Council to send international commissions of inquiry in order to detect the use of gases by Daesh and the regime troops across Syria, and to refer the perpetrators to specialist international courts.