sentence1: Dramatic footage obtained by the Guardian shows that the man who died at last week's G20 protests in London was attacked from behind and thrown to the ground by a baton-wielding police officer in riot gear. Moments after the assault on Ian Tomlinson was captured on video, he suffered a heart attack and died. The Guardian has handed a dossier of evidence to the police complaints watchdog. It sheds new light on the events surrounding the death of the 47-year-old newspaper seller, who had been on his way home from work when he was confronted by lines of riot police near the Bank of England.
sentence2: Ian Tomlinson was a police officer.