HSBC, Revolut, Lloyds and Bank of Scotland are among some of the banks reported to have been affected by a major outage at Google Cloud
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All four banks have experienced problems with their online services.
Revolut announced that "multiple services" were affected with thousands of users in the UK and Ireland unable to process certain actions.
"We are currently experiencing a service disruption affecting multiple services," a Revolut spokesperson told the BBC while also confirming that customers' money amnd data are safe.
"We've been working to fix the issue since it was identified this morning and apologise to anyone affected and for any inconvenience caused," they added.
Lloyds, HSBC, and Bank of Scotland customers also reported banking access and payment issues.
The issue seems to be with Google Cloud's services in London and the surrounding region. The company has confirmed that multiple services have been affected by the incident.
In a statement posted just before midday in the UK, Google described the outage as a "power event".
"Due to a power event we had suffered an outage within europe-west2-b zone. The power event is mitigated. Partial mitigation to infrastructure services will be observed within the next 30 minutes and the remaining services will be mitigated there after."
Regulators have voiced increasing concern about the concentration risk posed by a handful of large cloud computing providers on which so many banking services are dependent.