Police have closed streets in Salisbury as a “precautionary measure” after two people were taken ill from a restaurant, amid heightened tensions after the Novichok poisonings.
South Western Ambulance Service said it was called to the scene more than an hour earlier and dispatched four ambulances including a hazardous area response team.
A source briefed by the emergency services told the Press Association: “The ambulance crew at the site took the decision that the symptoms seemed consistent with Novichok poisoning which is why the called their colleagues in the police.”
But the source stressed: “The symptoms of Novhichok poisoning and particular types of narcotic abuse are very similar.”
One witness who was in Prezzo told the BBC those taken ill were “two Russians”, and that the woman became distressed after repeatedly getting up from her table and returning.
“When she came back she was hysterical. She called paramedics and the next thing an ambulance turns up and they come rushing in,” the unnamed witness said.
Public Health England was informed of the incident, while firefighters were also at the scene.
“I’ve been told two people were taken ill in there,” the student said.
“There’s a man in a full white body suit with a mask to his mouth going in and out of the back of the ambulance and the restaurant.
“The police were interviewing a couple of dozen people.”
A witness in the nearby Cafe Rouge restaurant said they could see police bagging something up in the street outside.
Wiltshire Police said: “Police were called by the ambulance service to Prezzo, High Street, Salisbury at 6.45pm today following a medical incident involving two people.
“As a precautionary measure, the restaurant and surrounding roads have been cordoned off while officers attend the scene and establish the circumstances surrounding what has led them to fall ill.”
A spokeswoman for the ambulance service said the patients were conscious at the last update and were being treated at the scene.
Tensions are heightened in the cathedral city because of recent Novichok poisonings.
The Italian restaurant is a short walk from Queen Elizabeth Gardens, which was until recently closed off after 44-year-old Dawn Sturgess was fatally poisoned by the nerve agent.
Also nearby is Zizzi, the Italian restaurant where former spy Sergei Skripal and his daughter Yulia visited before they were taken ill.
Police said Ms Sturgess was killed by the same chemical used in an alleged hit by Russian military intelligence officers on Mr Skripal.
Salisbury City Council leader Matthew Dean tweeted: “Understandably people concerned at latest possible incident in Salisbury but there have been a number of false alarms since the Skripal poisoning.
“Rightly the emergency services start with a highly precautionary approach until they know otherwise.”