Emergency services have been called to a restaurant in Salisbury after two people were taken ill.
Wiltshire Police said the area surrounding Prezzo restaurant has been closed while they work to establish what caused the "medical incident" involving a man and a woman on Sunday.
The ambulance service alerted detectives at about 6.45pm. Firefighters were also in attendance.
Witness Sam Proudfoot, 16, said he saw a person in a hazardous material suit go between the restaurant and the ambulance.
"I've been told two people were taken ill in there," he 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."
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."
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