The Dolphin Square building is seen in London March 5, 2015. Operation Midland has been set up to investigate child sex abuse claims, which involve politicians and other high-profile public figures and include allegations that three young boys had been murdered. Police have said the credible murder claims were made by an alleged victim who said he was sexually abused at locations across London and southeast England including military establishments and at Dolphin Square a central London block of flats close to parliament.REUTERS/Suzanne Plunkett (BRITAIN - Tags: POLITICS CRIME LAW SOCIETY)