Information technology supporting courts in the United Kingdom failed, and the failure is being blamed on a "data center outage" rather than a "cyber attack" (archived). Correspondence was lost, but the courts are emphatically insisting that no prisoners were "unlawfully freed" as unlawful freeing is impossible if court's determination of guilt can't be registered with the case management systems down.
All of the insisting that there was no foul play involved with no one "unlawfully" escaping the court supports the strong possibility of exactly that outcome when the reputation of the people doing the insisting is considered.