Dale Cregan still denies murdering father and son David and Mark Short, despite admitting to the killings of PCs Fiona Bone and Nicola Hughes.
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A High Court judge ruled he was entitled to "more than nominal" damages from police over a wrongful arrest he says destroyed his career.
The ex-Holby City star, who had been visiting Barcelona, detailed the events of the attack on Twitter as they unfolded.
Searches are continuing for victims, with around 600 people still missing and 3,000 left homeless after the disaster.