The organisers of last week's G20 demonstration in the City of London have called another march for this weekend to protest against the "killing" of Ian Tomlinson, the newspaper vendor who died after getting caught up in the demo.

Video has emerged which shows that the 47-year-old was hit and pushed to the ground by a baton-wielding police officer shortly before he collapsed and died of a heart attack. That footage, and the testimony of various witnesses at the protest, has called the official police version of events into question.

Mr Tomlinson was not involved in the protest, but was walking home after spending the day helping an Evening Standard vendor near Monument Station. His normal route home would take him past the Bank of England, where hundreds of protesters were corralled behind police barricades, and he was diverted to nearby Cornhill.

It was in a nearby alleyway, according to video footage obtained by The Guardian, that he was pushed over by a police officer in riot gear and apparently hit over the leg with a baton. He collapsed a few minutes later.

This weekend's march has been called by the self-styled "Government of the Dead", who organised last Wednesday's G20 Meltdown protest.

In what it termed an "Easter Rising", it called on protesters to gather outside the police station in Bethnal Green, where many of those arrested last week were taken, before a "solemn procession..to lay flowers where Ian was killed". Protesters were asked to wear black.

Mark Barrett, a spokesman for the group, said the marchers would be calling for a full and independent inquiry into the policing of last Wednesday's G20 protests.

Mr Barrett conceded that Mr Tomlinson had not been among the protesters, but said: "It was clearly a terrible thing that happened. From the footage we can see that the police acted against him as they acted against a lot of innocent people that day."

A Scotland Yard spokesman declined to comment on the call for a further protest.

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