British police believe a woman who died after being exposed to Novichok received a high dose of the nerve agent and must have handled its container.
Dawn Sturgess died on Sunday, just over a week after she fell ill in Amesbury in southern England.
Investigators suspect the deadly substance is linked to an attack in nearby Salisbury - where Novichok was used to poison a former Russian spy and his daughter in March.
Al Jazeera's Sonia Gallego reports from Salisbury.
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