The trial of a police officer accused of killing newspaper seller Ian Tomlinson during the G20 protests is on trial at Southwark Crown Court.

Pc Simon Harwood, 41, denies the manslaughter of Tomlinson during the demonstrations in April 2009.

The 47-year-old, who was homeless, collapsed and died near the Royal Exchange Buildings in the City of London after being hit with a police baton.

The prosecution says this caused his collapse two to three minutes later.

Tomlinson was on his way home on 1 April 2009, but had found his usual route blocked because of the G20 demonstrations.

Mark Dennis QC, for the prosecution, said there was a "clear temporal link" between the violence Tomlinson was subjected to and his death.

The trial is expected to last four to five weeks.