Marks & Spencer and the Co-op are among the British retailers that have been targeted by the cyber attacks.

Qatar-owned luxury retailer Harrods has secured its websites after hackers attempted to breach some of its online systems as part of a cyber attack that targeted multiple retailers in the United Kingdom.

“Our seasoned IT security team immediately took proactive steps to keep systems safe and as a result we have restricted internet access at our sites today [Thursday],” Harrods said in a press statement, according to the BBC.

Harrods confirmed that its flagship store remains open and online sales stay operational.

“All sites including our Knightsbridge store, H beauty stores and airport stores remain open to welcome customers. Customers can also continue to shop via harrods.com,” it added.

Harrods is the third major UK retailer targeted in a recent cyberattack, which also hit online systems at Marks & Spencer and the Co-op.

Marks & Spencer said in a statement on April 25 that it paused online orders after its systems were breached.

“Our product range remains available to browse online[…]Our experienced team – supported by leading cyber experts – is working extremely hard to restart online and app shopping,” it had said in the statement.

On April 28, tech site BleepingComputer reported that the hacking group Scattered Spider was behind the ransomware attack on Marks & Spencer. Cybersecurity experts said the group had accessed key systems and stolen data as early as February.

Richard Horne, chief executive of the National Cyber Security Centre (NCSC), said in a statement on Thursday that the agency was working with the affected companies “to fully understand the nature of these attacks and to provide expert advice”.

“These incidents should act as a wake-up call to all organisations. I urge leaders to follow the advice on the NCSC website to ensure they have appropriate measures in place to help prevent attacks and respond and recover effectively,” Horne said.