"Earlier this evening, Wiltshire Police and partners declared a major incident following a report that two people had fallen ill in Salisbury", police said in a statement early on September 17.
Amanda Worne, 47, from Yapton, near Arundel, West Sussex, said that "armageddon" broke out as police and the emergency services responded to the incident at the Prezzo restaurant in High Street, Salisbury, Wiltshire, at 6.45pm on Sunday.
The pub, as well as the surrounding roads have since been cordoned off "as a precautionary measure", while officers are investigating the scene.
"Investigators believe they have identified the suspected perpetrators of the Novichok attack through CCTV and have cross-checked this with records of people who entered the country around that time", a source with knowledge of the investigation told PA, the British domestic news agency.
The Skripals recovered after weeks in the hospital, but fallout from the attack has contributed to declining relations between the Kremlin and London and Western allies.
Half a dozen police cars, an ambulance, two incident response units and two fire engines were at the scene, he added.
The conditions of a man and woman who got sick at Prezzo restaurant in Salisbury was under investigation.
Police later stood down the major incident at around 12:30am after confirming "there is nothing to suggest Novichok is the substance", diffusing fears of another nerve agent attack.
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"Due to recent events in the city and concerns that the pair had been exposed to an unknown substance, a highly precautionary approach was taken by all emergency services".
Petrov and Boshirov later appeared on Russian television to claim their innocence.
Four ambulances were sent including a hazardous area response team, a spokeswoman said.
Police have said it was detected in a "small bottle".
Authorities responded with extreme caution on Sunday in light of the March poisoning of ex-Russian spy Sergei Skripal and his daughter, Yulia, in Salisbury, and the subsequent poisoning of two others who came into contact with Novichok.
The UK government has accused two Russian men, Alexander Petrov and Ruslan Boshirov, of attempting to kill the Skripals.
The two men went on Russian TV last week and said they were only tourists who had visited Salisbury to see its famous cathedral.