MI5 joins social messaging trawl for riot organisers

Intelligence agency asked to crack encrypted messages – especially on BlackBerry Messenger – to help police

Vikram Dodd, Richard Norton-Taylor and Josh Halliday

The security service MI5 and the electronic interception centre GCHQ have been asked by the government to join the hunt for people who organised last week’s riots, the Guardian has learned.

The agencies, the bulk of whose work normally involves catching terrorists inspired by al-Qaida, are helping the effort to catch people who used social messaging, especially BlackBerry Messenger (BBM), to mobilise looters.

A key difficulty for law enforcers last week was cracking the high level of encryption on the BBM system. BBM is a pin-protected instant message system that is only accessible to BlackBerry users.

MI5 and GCHQ will also help the effort to try to get ahead of any further organisation of disturbances. (more on guardian.co.uk)