Western governments say they're trying to verify reports of a possible chemical attack in Ukraine.
A battalion in Mariupol claims a Russian drone dropped a poisonous chemical - although no one was harmed.
Foreign Affairs Minister Simon Coveney says it's very concerning and "urgent verification of facts " is needed by our international partners.
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Sky's Deborah Haynes in Kyiv says the reports remain unconfirmed - but if proven would be highly significant:
