10 August 2011 Last updated at 13:39 GMT

England riots: Hackers hit Blackberry over police help

Team Poison has threatened to release company information if Blackberry discloses user data

A hacker group has attacked Blackberry's website after the company said it would assist police investigating riots in the UK.

Team Poison defaced the official Blackberry blog, posting a message that threatened the firm with retaliation if it handed user data to authorities.

Blackberry's instant messaging service is believed to have been used by some looters to plan their movements.

The firm has promised to co-operate with police and the Home Office.

In its statement, Team Poison said that it did not condone innocent people or small businesses being attacked in the riots.

However, it added: "We are all for the rioters that are engaging in attacks on the police and government."

The group argued that if Blackberry gave subscriber information to police, it could lead to the wrong people being targeted.

"Innocent members of the public who were at the wrong place at the wrong time and owned a Blackberry will get charged for no reason at all," said Team Poison's statement.

It threatened to release employee information, including names, addresses and phone numbers of Blackberry staff.

UK laws mean police can request data from individuals' mobile phones when that information relates to criminal activity.

The procedure is governed by the Regulation of Investigatory Powers Act.