Roads around an Italian restaurant in Salisbury have been cordoned off by police after a pair of diners were taken ill Sunday. The town in south-west England where former Russian double agent Sergei Skripal and his daughter Yulia had suffered a Novichok nerve agent poisoning earlier this year, is on alert amid ongoing investigations by Wiltshire Police.

'Police were called by the ambulance service to Prezzo, High Street, Salisbury at 6.45 pm (local time) today following a medical incident involving two people,' a Wiltshire Police statement said. '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,' it added.