Four people arrested after cyber attacks on M&S, Co-op and Harrods

Marks & Spencer was the subject of a cyber-attack (Yui Mok/PA)

Four young people have been arrested in the UK for their suspected involvement in the damaging cyber attacks against Marks & Spencer, the Co-op and Harrods.

Britain's 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.