The U.K. National Crime Agency said the suspects are in custody in relation to the hacks targeting Marks & Spencer, Harrods, and the Co-op.

Three men and one woman - aged between 17 and 20 - have been arrested in London and the Midlands.

M&S was forced to suspend online operations in April after hackers targeted its systems

Four arrested on suspicion of breaching Computer Misuse Act, blackmail, money laundering and joining activities of organised crime

Three male teenagers and a woman taken into custody in connection with retail cyber attacks

The U.K. National Crime Agency said the suspects are in custody in relation to the hacks targeting Marks & Spencer, Harrods, and the Co-op.