Paparazzi photographers have been issued a strong warning from the Duke and Duchess of Cambridge – to stop following their children.

An open letter from Kensington Palace has this morning revealed how Prince George and Princess Charlotte have come under increased surveillance from unauthorised snappers in recent months.

It said that several distressing incidents had put the youngsters’ safety at serious risk. One photographer had rented a tinted-window car in which he created a “hide” by hanging sheets inside.

Stocked with food and drinks, he then allegedly parked it in a discreet place by a children’s play area – where he remained for several hours hoping to snap images of the Prince.

He was rumbled by police – and found lying in the boot with his camera poised.

The letter, from the Palace’s communications secretary, said that long-range lenses had also been used to capture images of The Duchess playing with Prince George in private parks.

Photographers had also been monitoring his movements, taking pictures of the children of private individuals visiting The Duke and Duchess’s home and pursuing cars leaving family homes.

Some had also used other children to draw Prince George into view around playgrounds, and been found hiding on private property in fields and woodland locations around The Duke and Duchess’s home in Norfolk.

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Photo Credit: Mario Testino