Tesco Bank customers have been unable to access their mobile or internet banking since this morning.
Update 3pm: Tesco Bank now says its services are "working as normal".
Scores of Tesco Bank customers have posted on social media since 10.30am this morning to say they haven't been able to access their accounts.
The bank is telling customers on social media that it doesn't have a timescale on how long the issues will last but that it's looking to resolve them "as quickly as possible."
Tesco Bank says cards should be working as normal and that if you need to make payments you can still do so by contacting its customer service team on 0345 835 3353.
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What are customers saying?
Many Tesco Bank customers have taken to social media:
@tescobankhelp error code 601 so I canít login. Help pleaseó Louise Blackshaw (@lou_blackshaw) June 5, 2018
@tescobankhelp is the website down I cannot login to see my current credit card balance?ó Andy OD (@Andy_O_D) June 5, 2018
@tescobankhelp canít log in. Whatís going on?!ó Mike (@Mike61299672) June 5, 2018
@tescobankhelp looks like there are some technical issues on the site (trying to log in) - can you let me know the eta for fix please?ó flyingtortoise (@flyingtortoise) June 5, 2018
@tescobankhelp Why can't anyone check their online banking..... I've been trying all morningó Rebecca Helen 👑 (@anders_bec_90) June 5, 2018
What does Tesco Bank say?
A Tesco Bank spokesperson said: "We apologise to customers who are currently unable to access mobile and online banking.
"We are working hard to restore service and thank customers for their patience."