Fighters of the Azov Regiment, who are defending the city, reported this on Telegram, Ukrinform reports.
"About an hour ago, the Russian occupation forces used a poisonous substance of unknown origin against the Ukrainian military and civilians in the city of Mariupol, which was dropped from an enemy UAV. The victims have respiratory failure, vestibular-atactic syndrome," the statement reads.
The consequences of the use of the unknown substance are being clarified, the statement said.
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