ALSO READBritish police hunt culprit in Russian ex-spy's poisoning UK police: 21 people sought treatment after ex-spy poisoning UK races to find source of poison used against Russia ex-spy UK police believe Russian spy targeted with deadly nerve agent Russian spy poisoning: Police seeking nerve agent source
Around 180 British troops have been deployed to the English city of Salisbury to aid in the investigation of a nerve agent attack on a former Russian double agent and his daughter, the media reported.
Sergei Skripal, 66, and his daughter Yulia, 33, were still hospitalised in "very serious condition" after they were poisoned earlier this week, UK Home Secretary Amber Rudd said as she visited Salisbury on Friday.
The pair -- believed by authorities to have been deliberately targeted -- were found slumped on a bench near a shopping centre on the afternoon of March 4.
Rudd visited several of the sites cordoned off by investigators before heading to Salisbury District Hospital.
Authorities earlier revealed 21 people had received medical attention in the aftermath of the incident, but only three people were still being treated Friday, reports CNN.
Identifying the source of the nerve agent continues to be central to the probe but so far, Rudd has refused to name any potential culprits.
"We will have to wait until we're absolutely clear what the consequences could be, and what the actual source of this nerve agent has been," Rudd said.
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