Pentagon press secretary John Kirby said in a statement Monday, Ukrinform reports, referring to CNN.
“These reports, if true, are deeply concerning and reflective of concerns that we have had about Russia’s potential to use a variety of riot control agents, including tear gas mixed with chemical agents, in Ukraine,” Kirby said.
Read also: Russia’s chemical attack on Mariupol: Three persons affectedAccording to Kirby, the Pentagon will monitor the situation closely.
As Ukrinform reported, Andriy Biletsky, the founder of the Azov Regiment, said that Russian troops in Mariupol used a poisonous substance of unknown origin, which was dropped from a UAV.