The emergency services were called out to a Tesco supermarket in Buckinghamshire due a ‘medical incident’.

At around 10am on Tuesday, November 14, the police, paramedics, an air ambulance and a fire engine visited the Princes Risborough branch which resulted in the store’s car park being cordoned off.

Whilst it has not been disclosed what happened, it has been confirmed that the person in question was in need of ‘critical care’.

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A member of the public, who was driving along the A4010 between Loosley Row and Saunderton Lee said: “I was driving towards Risborough when I noticed a very bright light in the sky.

“It was raining, and I thought it couldn’t be a plane, then it hit me that it was an air ambulance.

“It had obviously just been to or near the town’s Tesco, so I hope the person involved is OK.”

Thames Valley Police were unable to comment, whilst the Thames Valley Air Ambulance said: “We can confirm that our helicopter was dispatched to provide advanced critical care at an incident in Princes Risborough today.”

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The incident prevented shoppers from entering the vicinity before things resumed as normal at around 11.30am.

In a brief statement, Tesco said: “Our Princes Risborough Superstore is open as usual following a customer incident earlier this morning.”