A member of the public found a memory stick in the street, only to find details of security for The Queen upon it.
The USB was found in London, containing 76 folders with information about the security measures used to protect Her Majesty at Heathrow Airport – including how to access restricted areas of the site, and the exact route The Queen takes to the airport.
The data, the paper explains, wasn’t encrypted, despite its sensitive content, and was simply picked up by a member of the public in Queen’s Park, West London. The Mirror handed over the stick to Heathrow authorities.
Maps on the USB depicted secret tunnels at the airport, the royal suite used by the Royal Family, escape shafts and details of security patrols at the airport.
Heathrow Airport, just a short drive from Windsor Castle, has launched an investigation into how the confidential security information was left in the open.
A Heathrow spokesperson told Sky News: “We have reviewed all of our security plans and are confident that Heathrow remains secure.
“We have also launched an internal investigation to understand how this happened and are taking steps to prevent a similar occurrence in future.”