Thousands of Monzo customers were unable to fully access their accounts after the bank reported technical problems.
The online bank told users they were ‘experiencing issues’ and the app will not be fully functional.
Account holders were still able to see their account details and send bank transfers, but it is not known whether they can use their cards.
More than 2,000 outages were reported online.
Monzo said: ‘We’ve identified the cause of the problem and we’re working on a fix.
‘We’re currently running the Monzo app in a backup mode but you’re still able to use your card as usual, make ATM withdrawals, and receive inbound and make outbound bank transfers.
‘We’re sorry about the trouble here.
‘Our team are working super hard to get the issue resolved, we really appreciate your patience in the meantime.’
The bank has since confirmed the incident has been resolved and customers are able to use their cards and accounts as normal.
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