Some Marks & Spencer (M&S) stores have been left with empty food shelves as the retailer continues to struggle with a cyber attack affecting its operations.
Online orders have been paused on the company's website and app since Friday, following problems with contactless pay and Click & collect over the Easter weekend.
The BBC understands food availability should be back to normal by the end of the week.
Meanwhile, security experts say a cyber crime group calling itself DragonForce is behind the mayhem.
The firm has stopped taking orders on its website and apps, including for food and clothes.
Marks & Spencer (M&S) says it has stopped taking online orders as the company struggles to recover from a cyber attack.
Customers began reporting problems last weekend, and on Tuesday the retailer confirmed it was facing a "cyber incident".
Now, M&S has entirely paused orders on its website and apps - including for food deliveries and clothes - and says it will refund orders placed by customers on Friday.
The firm's shares fell by 5% following the announcement, before recovering.
Online orders remained paused on Saturday morning.
"We are truly sorry for this inconvenience," the retailer wrote in a post on X.
"Our experienced team - supported by leading cyber experts - is working extremely hard to restart online and app shopping.
"We are incredibly grateful to our customers, colleagues and partners for their understanding and support."
Data centres in the UK are to be classified as critical national infrastructure, joining the emergency services, finance and healthcare systems, and energy and water supplies.
It means they would get extra government support during a major incident, such as a cyber attack, an IT outage or extreme weather, in order to minimise disruption.
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