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The luxury department store Harrods says it is the latest retailer to have been targeted by a cyber attack.
The firm said it had "restricted internet access at our sites" following an attempt to gain access to its systems.
It comes the day after the Co-op shut down parts of its IT systems to fend off a hack, while Marks & Spencer continues to deal with a cyber attack that has cost it millions of pounds in lost sales.
Harrods said its flagship store remained open, and it continues to operate its online sales.
Customers are not being asked to not "do anything differently at this point".
A statement from Harrods read: "We recently experienced attempts to gain unauthorised access to some of our systems.
"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.
"Currently 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.
"We are not asking our customers to do anything differently at this point and we will continue to provide updates as necessary."
Meanwhile, M&S has seen its operations severely hampered by a cyber attack it disclosed last week.
Customers are still unable to place online orders and shelves have been left empty in some stores.
The police are investigating.
The Co-op said on Wednesday that it had shut down parts of its IT systems in response to hackers attempting to gain access.
On Thursday it emerged staff were being ordered to keep their cameras on during remote work meetings, and verify all attendees.
Experts say that indicates the company suspects hackers may be lurking in calls.