Click for more Nelson Mandela memories: http://bit.ly/1aFcRts Prince William has called the death of Nelson Mandela "extremely sad and tragic", describing him as an "extraordinary and inspiring man". The Duke and Duchess of Cambridge were watching a film about the former South African president when the news of the 95-year-old's passing broke. Mandela: Long Walk To Freedom, a film based on Mr Mandela's extraordinary life, premiered in Leicester Square in London as part of the Royal Film Performance on Thursday night. The film's cast, including British actor Idris Elba, who plays Mr Mandela, and Mr Mandela's daughter, Zindzi, were also at the event. Subscribe to ITN News: http://bit.ly/itnytsub Like us on Facebook: http://www.facebook.com/itn Follow us on Twitter: http://twitter.com/itn Add us on Google+: http://bit.ly/17z0Dpd More stories on Nelson Mandela: Nelson Mandela dies at 95: A tribute to the South African leader- http://bit.ly/1jt1iNB Nelson Mandela's very first television interview: http://bit.ly/18noRD4 South African President Jacob Zuma announces Madiba's death: http://bit.ly/1eUBarw US President Barack Obama pays tribute to Nelson Mandela: http://bit.ly/18not7E UK Prime Minister David Cameron calls Nelson Mandela a hero: http://bit.ly/19lbOiC Mandela's daughter talks about her father hours before his death: http://bit.ly/1hBNQaM Prince William pays tribute to Nelson Mandela: http://bit.ly/18plzfw Beautiful Nelson Mandela tributes from around the world: http://bit.ly/IUoLdd See 2013's Most Watched Videos: http://bit.ly/14iM9r5 See our Biggest Videos of All Time: http://bit.ly/11GI36D See 2012's Most Watched Videos: http://bit.ly/18R1boW