Four people have been arrested by police investigating the cyber attacks targeting M&S, Co-op and Harrods.
A 20-year-old woman and two males, aged 19, and one aged 17, were detained in London and the West Midlands this morning by officers as part of a National Crime Agency (NCA) operation.
They were arrested on suspicion of Computer Misuse Act offences, blackmail, money laundering and participating in the activities of an organised crime group.
M&S stopped online orders and customers faced empty shelves in shops after the cyber attack on the retailer earlier this year.
The Co-op and Harrods were also targeted by hackers in April and May.
The individuals were arrested at their homes by officers from regional organised crime units and their electronic devices were seized for analysis.
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