I took this interesting scene at the public event organized by the photographers' union against the restrict right of photographers in the UK.
In this recent law (Section 44 of the Terrorism Act 2000) the police force have a wide powers to stop and search anyone for "articles of a kind which could be used in connection with terrorism" regardless of whether they have reason to suspect that the presence of such article, if found.
More than 500 photographers with various cameras attended on Saturday 23rd January 2010 in the Trafalgar Square, London, England.

I'm a Photographer, not a Terrorist!