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Rioters using Blackberry Messenger

9 August 2011 Last updated at 15:54 BST

Rioting youths in Britain are said to be using instant messaging on Blackberry phones and social media platforms such as Twitter to co-ordinate attacks and stay ahead of the police.

Iain Mackenzie is a BBC technology reporter and he says it will be "a challenge" for police to track down those rioters using Blackberry Messenger.