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By Tom Gerken
Technology reporter
Thousands of HSBC customers in the UK have reported that they are unable to access mobile banking.
Downdetector, which tracks websites, showed more than 3,900 people had reported the banking app on their device was not functioning.
The problem comes on Black Friday, a day when many people will be making purchases due to the discounts offered by retailers.
The firm said it was "investigating this as a matter of urgency".
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It is understood customers of First Direct, a division of HSBC UK, may also be affected.
The firm has around 14.8 million customers across the UK, though it is not known how many of these use mobile banking.