HSBC customers are confronted with the following error message
Update – 10:10 BST
HSBC is now telling customers it is "investigating" complaints that it is experiencing an outage.
The customer service twitter account claims, "We are investigating this and will provide an update when possible.
"Please try later or call us if your query is urgent."
HSBC customers have been left unable to login this morning.
Banking customers are purportedly unable to access the mobile app and online portal – with many reporting being confronted with a GSA error message.
Independent website DownDetector, which tracks social comments around a certain topic to monitor outages across the globe, shows hundreds of HSBC customers hit by the problems.
Reports of a mobile network outage first started to appear online at 9:00am BST.
According to DownDetector's crowd-sourced data, the outage appears to hit users across the United Kingdom.
Hundreds of customers have complained about the outage affecting the UK
HSBC customers across the UK have been hit by the latest outage
Get Quotes on Home Insurance
DownDetector claims 66 per cent of those HSBC customers complaining about the outage have been left without internet banking.
Another 27 per cent no longer have access to the mobile app, while 5 per cent have been left unable to access the website.
Hundreds of customers have flooded social media to complain about the purported outages.
"Struggling to log into @HSBC_UK app – are you having issues?" one customer moaned.
Another added: "Online on desktop and app. Both show a connection error. On desktop it throws some Gsa error"
One tweeted: "I can't get through the online banking system this AM. Keep being told there's a system error – is the site currently down?"
HSBC customers have taken to social media to complain
Not everyone is convinced by HSBC's advice to delete cookies and cache
The official HSBC account has yet to acknowledge any problems with the banking app.
However, it is recommending some customers who are confronted with the GSA error message delete the cookies, cache and history in their web browser.
"Please delete your cookies, cache and history and try again. Let me know how you get on," the customer service account tweeted.
Not everyone is convinced that this is the solution required for the outage.
One user replied to the official HSBC account, writing "stop telling everyone to delete their cookies there is obviously an issue with your system!"
- More To Follow