The Duke of York has been targeted in a bus stunt organised by a US lawyer representing some of the victims of sex offender Jeffrey Epstein.
A US yellow school bus was driven past Buckingham Palace with a message on the side appealing for Andrew to answer questions from the FBI over their Epstein investigation.
The message, featuring pictures of the duke, said: "If you see this man please ask him to call the FBI to answer their questions."
The duke has stepped away from royal duties following his disastrous Newsnight interview about his relationship with Epstein.
Lawyer Gloria Allred, who represents some of Epstein's victims, was behind the stunt which saw the bus drive past the palace a few times over the space of an hour.
Prince Andrew - Duke of York
Prince Andrew - Duke of York
Britain's Prince Andrew, Duke of York visits the Royal National Orthopaedic Hospital to open the new Stanmore Building, in London, Britain March 21, 2019. David Mirzoeff/ Pool via REUTERS
Britain's Duke of York visits the Chelsea Flower Show in London, Britain May 20, 2019. Yui Mok/Pool via REUTERS
Britain's Prince Andrew, Duke of York, (L) and Britain's Prime Minister Boris Johnson (R) attend the annual Royal British Legion Festival of Remembrance at the Royal Albert Hall in London on November 9, 2019. (Photo by Chris Jackson / POOL / AFP) (Photo by CHRIS JACKSON/POOL/AFP via Getty Images)
Dame Vivian Hunt and Prince Andrew, Duke of York arrive through the East Gallery during the State Banquet, on day one of the U.S. President's Donald Trump state visit, at Buckingham Palace, London, Britain, June 3, 2019. Victoria Jones/Pool via REUTERS
LONDON, ENGLAND - JULY 04: Prince Andrew, Duke of York attends the semi-final match between Noval Djokovic and Grigor Dimitrov on centre court at The Wimbledon Championships at Wimbledon on July 4, 2014 in London, England. (Photo by Karwai Tang/WireImage)
Britain's Prince Andrew, Duke of York meets patient Brenda Tilbury during a visit the Royal National Orthopaedic Hospital to open the new Stanmore Building, in London, Britain March 21, 2019. David Mirzoeff/ Pool via REUTERS
ASCOT, UNITED KINGDOM - JUNE 18: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Andrew, Duke of York & Queen Elizabeth II watch the horses in the parade ring as they attend Day 2 of Royal Ascot at Ascot Racecourse on June 18, 2014 in Ascot, England. (Photo by Max Mumby/Indigo/Getty Images)
The Duke of York (left) and the Duke of Cambridge during the Remembrance Sunday service at the Cenotaph memorial in Whitehall, central London. (Photo by Victoria Jones/PA Images via Getty Images)
LONDON, ENGLAND - NOVEMBER 09: Prince Andrew, Duke of York attends the annual Royal British Legion Festival of Remembrance at the Royal Albert Hall on November 09, 2019 in London, England. (Photo by Chris Jackson/- WPA Pool/Getty Images)
ASCOT, ENGLAND - JUNE 17: (L-R) Prince Andrew, Duke of York and Prince Harry attend day one of Royal Ascot at Ascot Racecourse on June 17, 2014 in Ascot, England. (Photo by Chris Jackson/Getty Images for Ascot Racecourse)
ASCOT, ENGLAND - JUNE 20: Prince Andrew, Duke of York attends Day 4 of Royal Ascot at Ascot Racecourse on June 20, 2014 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
BEIJING, CHINA - OCTOBER 24: (CHINA OUT) Prince Andrew, Duke of York speaks during the 10th anniversary of Harrow International School Beijing on October 24, 2014 in Beijing, China. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)
ISTANBUL, TURKEY - NOVEMBER 29: Turkey's Foreign Minister Mevlut Cavusoglu (R) meets with Duke of York Prince Andrew in Istanbul, Turkey on November 29, 2014. (Photo by Turkish Foreign Ministry/Cengiz Oguz Gumrukcu/Anadolu Agency/Getty Images)
ISTANBUL, TURKEY - NOVEMBER 29: Duke of York Prince Andrew attends to the Turkish-British Tatli Dil (mellifluence) Forum in Istanbul, Turkey on November 29, 2014. (Photo by Ahmet Dumanli/Anadolu Agency/Getty Images)
U.S. President Donald Trump, First Lady Melania Trump and the Duke of York are seen at Westminster Abbey as part of their state visit in London, Britain June 3, 2019. Stefan Rousseau/Pool via REUTERS
Prince Andrew has spoken briefly about claims he had sex with an underage girl. Giving a speech in Davos the Duke of York reiterated his denials of the allegations.
ASCOT, ENGLAND - JUNE 19: Queen Elizabeth ll, Prince Philip, Duke of Edinburgh, Prince Harry and Prince Andrew, Duke of York arrive in an open carriage to attend Ladies Day at Royal Ascot on June 19, 2014 in Ascot, England. (Photo by Anwar Hussein/WireImage)
Britain's Queen Elizabeth II and the Prince Andrew, the Duke of York (L) speak with John Maynard, 80, from Stoke on Trent via the internet on a Nominet Trust display, during a reception to recognise the British technology sector at Buckingham Palace in central London on June 9, 2014. AFP PHOTO/POOL/ STEVE PARSONS (Photo credit should read Steve Parsons/AFP/Getty Images)
Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 22, 2019 Britain's Queen Elizabeth and Britain's Prince Andrew, Duke of York arrive at Ascot REUTERS/Toby Melville
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She has called on the duke in the past to come forward and make a statement.
Her comments have been echoed by US lawyer Geoffrey Berman, who is leading the Epstein sex trafficking inquiry.
He told a news conference in January the duke had "provided zero cooperation", claiming his lawyers had been contacted by prosecutors and the FBI as part of the probe.
But a few days later Andrew was reported to be "angry and bewildered" at the claims by the US authorities, with the Telegraph quoting a source as saying: "The duke is more than happy to talk to the FBI but he hasn't been approached by them yet."
Reports later said the investigators stood by their comments that they had tried to contact Andrew's lawyers.