Package sent to him may have held the toxin Fears Sergei’s wife may have been victim

and the 29 Explosive Ordnance Group were among them. A car driven by Detective Sergeant Nick Bailey, the Wiltshire police officer who first went to the aid of the stricken dad and daughter, was removed from the scene.

He is still recovering in intensive care. It is believed he came into contact with the substance at Sergei’s home on the city outskirts.

A military convoy was seen driving to Salisbury District Hospital where Sergei and Yulia are being treated.

Scotland Yard, which is leading the investigation, said the military was brought in because they have the “capability and expertise” but insisted there was no danger to the to the aid of the stricken pair. Police wider public from any poison. are scouring the footage for potential

Home Secretary Amber Rudd clues. visited Salisbury and the hospital Experts last night feared a “onetime yesterday. only” nerve agent may have

She said Sergei and Yulia were in been used on the attack, making it a “very serious” condition and almost impossible to trace where added: “For the officer, I understand it came from. it’s serious, but he’s still conversing One said: “Most terrifying of all, and engaging.” scientists at Porton Down may not

Cctvfootageemergedshowing have an antidote or be able to what may have been Sergei and develop one if they cannot detect Yulia minutes before they what this one is.” collapsed. A female dog walker is Intelligence chiefs are reportedly also seen near the pair at 4.08pm. just “days” from establishing hard

At 4.15pm a police car speeds proof the plot was ordered by down the pedestrian alleyway after Moscow. No 10 said: “We will take receiving a 999 call. A minute later any necessary actions.” a paramedic can be seen running