GENEVA, April 5. /TASS/. Some people who were killed and injured in the recent airstrike in Syria’s Idlib Governorate, were affected by nerve agents, the World Health Organization (WHO) said in a statement on Wednesday.

"Some cases appear to show additional signs consistent with exposure to organophosphorus chemicals, a category of chemicals that includes nerve agents," the statement reads. The WHO added that "the likelihood of exposure to a chemical attack is amplified by an apparent lack of external injuries reported in cases showing a rapid onset of similar symptoms, including acute respiratory distress as the main cause of death." According to the WHO, the people suffered "from breathing difficulties and suffocation."

On Tuesday, Reuters cited the London-based Syrian Observatory for Human Rights saying that an airstrike on Syrian’s town of Khan Shaykhun had killed 58 people including 11 children. Reuters alleged that the chemical attack could have been carried out by "Syrian government or Russian jets."

The Russian and Syrian militaries denied their involvement in the attack. Russia’s Defense Ministry later said that on April 4, the Syrian air force had delivered an airstrike on the eastern outskirts of Khan Shaykhun to destroy militant facilities used to produce chemical bombs. These bombs were sent to Iraq and were previously used in Aleppo.