Media playback is unsupported on your device

FW de Klerk: Mandela 'was a great unifier'

5 December 2013 Last updated at 23:48 GMT

Former South African president FW de Klerk has paid tribute to Nelson Mandela, who has died in Johannesburg aged 95.

Mr de Klerk said: "It's a very sad moment... he was a great unifier."