Forensic investigators, wearing protective suits, emerge from the rear of John Baker House, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
Police officers stand outside the street where Dawn Sturgess lived before dying after being exposed to a Novichok nerve agent, in Salisbury, Britain, July 19, 2018. REUTERS/Hannah McKay
Forensic investigators wearing protective suits enter the rear of John Baker House, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
Fire and Rescue Service personel arrive with safety equipment at the site of a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
A police officer stands guard behind a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
Police investigators arrive at the site of a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
Fire and Rescue Service personel prepare safety equipment at the site of a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
Police forensic tents can be seen to the rear of John Baker House, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 6, 2018. REUTERS/Henry Nicholls
A police officer stands in front of screening erected behind John Baker House as forensic tents are erected, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 5, 2018. REUTERS/Henry Nicholls
Police forensic tents can be seen to the rear of a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 5, 2018. REUTERS/Henry Nicholls
A police officer stands in front of screening erected behind John Baker House, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 5, 2018. REUTERS/Henry Nicholls
A police officer stands outside John Baker House, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 5, 2018. REUTERS/Henry Nicholls
Police officers guard the entrance to a housing estate on Muggleton Road, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Amesbury, Britain, July 5, 2018. REUTERS/Henry Nicholls
A police officer guards a cordoned off rubbish bin on Rolleston Street, after it was confirmed that two people had been poisoned with the nerve-agent Novichok, in Salisbury, Britain, July 5, 2018. REUTERS/Henry Nicholls