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A police officer has been interviewed under caution on suspicion of manslaughter after a second post-mortem on a man who died during the G20 protests in London.

New tests suggest Ian Tomlinson, 47, died of abdominal bleeding, not a heart attack, as first thought.

Mr Tomlinson was struck and pushed over by a police officer during protests on 1 April in the City. Daniel Sandford reports.