TESCO's website and app has crashed leaving thousands of customers unable to log into their accounts.
According to Downdetector, almost 2,000 shoppers have reported problems this evening.
The outage means Tesco customers can't begin or amend their food delivery orders.
When shoppers try to log in, they receive an error message which says: "It's not you, it's us.
"There's a problem at our end, but we're trying to fix it right now. Sorry for any inconvenience. Please come back later and try again.
"Thanks for your patience."
The supermarket said on Twitter that it does not know when the problem will be fixed.
Frustrated customers took to social media to complain about the outage.
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One Twitter user said: "Yet again can’t log in to the app or your website and I have a delivery due. This really isn’t good enough."
Another added: "What’s up with the app? Has logged me out and wont allow me to log back in."
The Sun has contacted Tesco for further comment.
The grocer suffered a similar outage in January, leaving shoppers locked out of their accounts.
There was another glitch in November last year, leaving customers unable to pay for online shopping orders as well.
The month before, the store's website and app went down again "due to a hack" resulting in chaos for hundreds of online shoppers.
How to check if the Tesco app and website are not working
The best way to see if there are issues with the Tesco website or app is to check directly.
The supermarket is currently showing an error message making it clear that the problems are widespread.
You can check if Tesco is down for everyone or experiencing wider issues on Downdetector.
Shoppers can also check the supermarket's social media pages for updates.
Can you claim compensation for outages?
There's no fixed compensation scheme for supermarket websites being down like you might find with other essential services, like telecoms.
But if you've been left out of pocket by being unable to access your account or delivery details it's worth contacting Tesco.
You should gather evidence, for example a delivery receipt, and contact Tesco's customer service.
For online grocery order issues you can call 0800 323 4040 which is free to call from landlines and mobiles.
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