Salisbury District Hospital declared a “major incident” on Monday 5 March, after two patients were exposed to an opioid. The fire service was called to decontaminate the hospital’s Accident & Emergency unit, as paramedics treated the casualties.

Emergency personnel arrived to the scene, wearing full-body hazardous materials protective and an incident response unit was on site.

It followed an incident hours earlier in which a man and a woman were exposed to the drug Fentanyl in the city centre. The opioid is 10,000 times stronger than heroin.

A spokesman for Salisbury NHS Foundation Trust said: "We are currently dealing with a major incident involving a small number of casualties, with a multi-agency response. It is under 10 people, but I cannot say any more at the moment.

"People with outpatient appointments in other areas of the hospital can still come in as planned, but we are asking people not to come to the Accident and Emergency department unless it is an emergency."