The Kurdish People's Protection Units (YPG), which is operating in northern Syria, stated on Saturday that ISIS used poisonous gas in its previous assaults on the border town of Kobane - also known as Ayn al Arab - in late June.
According to the YPG, assaults by ISIS militants against YPG-held areas in the northeastern province of Hasakah involved the usage of poisonous gas on June 28 and 29.
The type of chemicals used has not yet been identified, Redur Xelil, a YPG spokesman said.
The Syrian Observatory for Human Rights (SOHR), a UK-based monitor group that reports on the Syrian conflict via an activist network on the ground, further confirmed YPG’s claims by stating that it had also documented the use of poison gas by ISIS in northeastern Syria on June 28.
The observatory quoted doctors’ testimonies and analyses as suggesting that 12 YPG militants suffered symptoms of poison gas attacks such as vomiting, suffocating and burning sensations in the eyes.
The doctors’ testimonies and laboratory results reportedly confirmed that ISIS used poisonous gas in its bombardment on the town but were unable to identify whether the gas used during the shelling was chlorine or a similar kind of gas.
SOHR also stated that it received further evidence that ISIS used poisonous gas when it targeted the district of al-Salihiyya in the city of al-Hasakah.
The observatory additionally documented the death toll during the Islamic holy month of Ramadan as being 5,026 people, 1,220 of whom were civilians - including 224 children and 222 women.
Kobane witnessed the death of 285 people, including 29 children and 60 women - all executed by ISIS militants.