A protest supporting Palestine Action, the campaign group proscribed in Britain as a terror organisation, is being organised on a US website.

At least 500 demonstrators are planning to gather on August 9 in central London to hold signs saying: “I oppose genocide, I support Palestine Action.”

The Metropolitan Police has warned the protesters to “expect to be arrested”.

The demonstration has been organised by Defend Our Juries, which is leading a campaign to reverse Palestine Action’s proscription, under which hundreds have already been arrested.

It is using the United States-based website Action Network to tell would-be protesters to express support for the group in such large numbers that the police cannot arrest all of them. 

But Defend Our Juries has denied the use of a foreign website is a ploy to dodge the UK ban on Palestine Action.