The incident, which has paralysed Royal Mail's Worldwide Distribution Centre in West London, was carried out by Russian hacker gang known as Lockbit, it has been revealed.
Royal Mail said on Wednesday it was suffering "severe service disruption" to its international export services following a cyber incident.
The company is calling it a "cyber-incident" rather than a cyber attack because it does not know what has caused the problem, the BBC has been told.
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