British police have begun a murder investigation after a women, who was exposed to a nerve agent in Wiltshire died
44-year old Dawn Sturgess fell ill last week after coming into contact with Novichok
Her partner remains in a critical condition
The UK Home Secretary Sajid Javid visited the site of this most recent poisoning and also the town of Salisbury where former Russian spy Sergei Skripal and his daughter were poisoned with the same nerve agent earlier this year
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