By Tim Montgomerie
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The tweets of Chris Williamson, Labour MP for Derby North, speak for themselves*.
The unrest last night followed the fatal shooting by local police of a 29-year-old man on Thursday. A protest at the shooting got out of hand. The BBC has more here.
* Hat tip to Iain Dale who spotted Mr Williamson's late night Twittering.
9.15am: Prime Minister's statement: