Britain's interior minister says the nerve agent that poisoned an English couple is the same variety as that used against former spy Sergei Skripal and his daughter, but it's not clear whether the two samples came from the same batch.
Home Secretary Sajid Javid says scientists at Britain's defense research lab are certain "this is the exact same nerve agent from the Novichok family" as the one that poisoned Sergei and Yulia Skripal in March.
He said "we cannot attribute this to the same batch at this point" but scientists are investigating.
Britain blames Russia for the Skripals' poisoning. Moscow denies involvement.
Detectives are investigating whether the latest victims were exposed to Novichok left over from the Skripal poisoning, possibly in a Salisbury park.
Javid said "it's completely unacceptable" for British parks "to be dumping grounds for poison."
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