Personal details about the UK's ambassador to the UN and future head of MI6, Sir John Sawers, have been removed from social networking site Facebook because of security concerns.
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The move comes after the Mail on Sunday alerted the Foreign Office that personal details about Sawers, family and friends were accessible to 200 million Facebook users, according to the BBC.
The paper said Lady Sawers had posted the information on Facebook without any privacy restrictions, making the entries accessible to all users in the open-access London network.
The information is said to have included the location of the couple's London flat, the whereabouts of their three grown-up children and of Sir John's parents, and details friendships with senior diplomats.
Foreign secretary David Miliband denied claims security had been compromised. No state secrets have been revealed, he said.
But politicians across the political spectrum have called for reassurances and an investigation into the security implications for MI6 as well as Sir John and his family.
Sir John is due to succeed Sir John Scarlett as head of the Overseas Secret Intelligence Service (MI6) in November.