David Cameron has announced Downing Street's flag will fly at half-mast on Friday as world leaders paid tribute to Nelson Mandela, the revolutionary South African president, who died on Thursday aged 95.
Mandela, who died peacefully with family alongside him, was a "hero of our time", the prime minister wrote on Twitter shortly after the confirmation of Mandela's death by the incumbent president Jacob Zuma.
Cameron was joined by a number of world leaders including the US president Barack Obama, European Commission leader Jose Manuel Barroso and ex-Australian prime minister Julia Gillard in offering their condolences to the family of Mandela and his countrymen on the site.
The Labour leader Ed Miliband later wrote that "Nelson Mandela showed us the true meaning of courage, hope, and reconciliation".
Bill Clinton, president in the United States during Mandela's time in office, tweeted that he "would never forget his friend Madiba", accompanied by a picture of the two close friends.
Click through the slides below to read world leaders' reactions to the death of the legendary man.