HSBC customers have been left without online and mobile banking services on Black Friday.

Shortly before 9am on Friday the bank said it was investigating the issue “as a matter of urgency” and apologised to customers.

It is working to restore mobile and online banking service, HSBC said, including authorising online card purchases via the app.

But purchases can be authorised via an SMS code, it said, allowing shoppers to purchase online as normal.

The disruption is due to an “internal system issue” and an update will be shared as soon as possible, the lender added.

As today is the last Friday of the month it’s likely to be payday for many across the UK.

“We understand this is really frustrating for some of our customers, and we are really sorry for the inconvenience,” HSBC said.

More on Black Friday

Some customers are being told, via their mobile phones, that a “system upgrade” is under way.

Subsidiary banks of HSBC are unaffected with First Direct and M&S Bank not experiencing issues.