Professional and amateur photographers are planning to gather in London's Trafalgar Square later to protest against terror stops and searches.
The photographers say police are intimidating people with cameras in tactics to target possible terrorists.
Last week the European Court of Human Rights ruled the power to stop people without suspicion was indiscriminate.
The government is appealing - saying it is vital to make cities a hostile place for any possible attacker.
The demonstration comes after a year of rising tensions between professional photographers and police over the exact scope of Section 44 of the Terrorism Act 2000.
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