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British Prime Minister David Cameron on Wednesday defended his behaviour at Nelson Mandela's memorial service in South Africa after he was criticised at home for posing with U.S. President Barack Obama for what some said was a disrespectful photograph. The self-portrait - known as a "selfie" in online social media - was taken on Tuesday in Soweto at the memorial event for Mandela, who died last Thursday aged 95. It captured Cameron and Obama - who suffered a similar ticking off in the U.S. media - smiling broadly either side of Danish Prime Minister Helle Thorning-Schmidt. All three appeared to be in high spirits and sharing a joke as a stern-faced Michelle Obama looked away.