Wiltshire Police and partners have this evening declared a major incident after it is suspected that two people might have been exposed to an unknown substance in Amesbury.
Emergency services were called to an address in Muggleton Road, Amesbury on Saturday evening (June 30) after a man and woman, both in their 40s, were found unconscious in a property.
They are both currently receiving treatment for suspected exposure to an unknown substance at Salisbury District Hospital. They are both in a critical condition.
Amesbury is about eight miles from the Salisbury Russian spy poisoning site.
Former Russian spy Sergei Skripal and his daughter Yulia were poisoned with Novichok, a suspected military nerve agent, in March.
It was initially believed that the two patients fell ill after using possibly heroin or crack cocaine from a contaminated batch of drugs. However, further testing is now ongoing to establish the substance which led to these patients becoming ill and we are keeping an open mind as to the circumstances surrounding this incident.
At this stage it is not yet clear if a crime has been committed. A police investigation has been established. In addition, a full multi-agency response has been co-ordinated.
Public Health England is working closely with both national government and local services to respond to this incident.
Mike Wade, Deputy Director of Health Protection in the South-West, said:
Our current advice, based on the number of casualties affected, is that it is not believed that there is a significant health risk to the wider public. We will keep this assessment under constant review as further information becomes known.