Asda’s card payment system crashed leaving Sunday shoppers facing huge delays as shoppers were unable to pay in-store with cards in all of Asda’s supermarkets across the country.

CBR asked if the technical issue was the result of a system upgrade.

An Asda spokesperson said: “We are in the process of resolving a technical issue with our card payment system in stores. We’re continuing to process payments as quickly as we can but apologise to our customers for the inconvenience this has caused.”

Asda IT is run in-house. The grocer is owned by US retail giant Walmart.

It was the second time in a week that Asda was hit by a technical glitch.

Seven days ago it was reported that Asda online customers were reportedly left frustrated after a glitch led to a cancelation of orders.

According to theregister.co.uk an Asda spokesperson said at the time that the issue had been dealt with: “As an apology to our customers affected by a technical glitch today during a major system upgrade we are offering a £15 discount and are rebooking their orders for as soon as convenient to them.”

In 2014 Asda opened a technology centre at its Leeds head office to raise its service levels for online customers.

Walmart says: “Each week, nearly 260 million customers and members visit our 11,539 stores under 63 banners in 28 countries and e-commerce websites in 11 countries. With fiscal year 2016 revenue of $482.1 billion, Walmart employs approximately 2.3 million associates worldwide.”

The BBC reported that queues formed and customers resorted to social media to vent frustration. It said Asda’s efforts to restore systems saw some stores back online quicker than others.