No photos. We are British officers

Tourists better think twice now before snapping pictures of the iconic British bobby.

A new British anti-terrorism law went into effect on Monday that could effectively bar photographers from taking pictures of police or military personnel - a move that prompted some 200 photographers to protest outside of Scotland Yard's headquarters.

Although the measure aims to prevent terrorists from taking reconnaissance shots, photographers say it could be misused at a whim to stop any pictures from being taken, especially images involving police abuse and demonstrations.