12 October 2011 Last updated at 20:43 ET
Bomb explodes at Londonderry City of Culture officeA bomb has exploded outside the City of Culture offices in Londonderry.
Police say they are not aware of any injuries and the damage to the building appears to be relatively minor.
A warning with a recognised codeword is understood to have been given at around 22:00 BST - less than an hour before the explosion in Guildhall Square.
Security sources say the attack had all the hallmarks of dissident republicans, who damaged a door of the same building with a pipe bomb in January...
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