Three teenagers and a woman have been arrested in the UK as part of an investigation into cyber attacks targeting Marks & Spencer, Co-op and Harrods.
The National Crime Agency (NCA) said the individuals were arrested early on Thursday morning on suspicion of blackmail, money laundering, offences linked to the Computer Misuse Act and participating in the activities of an organised crime group.
The arrests included a 17-year-old British man from the West Midlands, 19-year-old Latvian man from the West Midlands, 19-year-old British man from London and 20-year-old British woman from Staffordshire.
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