The London Metropolitan Police have released video footage of an attack on the car of Prince Charles and Camilla during protests in December 2010.
Police are looking to trace three suspects - a woman and two men - according to the Daily Mail.
In the video, the suspects can be seen attacking the car, which was transporting Prince Charles and his wife Camilla, the Duchess of Cornwall to the theatre.
The protests were sparked by news the UK government was raising tuition fees. Thousands of students and supporters swarmed the London area for several days.
Anyone with information on the suspects should call the Operation Malone team 020 8358 0100 or Crimestoppers on 0800 555 111.