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M&S has been targeted in a cyber attack which has left it unable to process online orders or take contactless payments.
There have also been cyber attacks against Harrods and Co-Op, which are being investigated.
Some experts predict it could be costing M&S millions of pounds each day.
The notorious hacking group, Scattered Spider, is believed to be behind the attack on M&S.
A cyber security company has told Sky News the group is “one of the most dangerous and active groups” they are monitoring.
On today’s Sky News Daily Niall Paterson talks to our science and technology reporter, Mickey Carroll, about Scattered Spider and what can be done to tackle cyber gangs.
Producer: Natalie Ktena
Editor: Wendy Parker
