Premise: A man who died during the G20 protests was pushed back by a police line minutes earlier, independent investigators have said. Ian Tomlinson, 47, who died of a heart attack, was blocked from passing through a police cordon as he attempted to walk home from work at a newsagent, the Independent Police Complaints Commission (IPCC) said. He was caught on several CCTV cameras walking up King William Street where he was confronted by uniformed officers shortly before 7.30pm last Wednesday.
Hypothesis:  Ian Tomlinson suffered a fatal heart attack