NatWest has apologised after customers were left unable to use its mobile banking app in the UK, leaving some unable to access their bank accounts.
More than 3,000 people have reported the problem on outage-checker site Downdetector since the issues first emerged at 0910 GMT.
The firm said on its service status website that its online banking service was still working normally, as were card payments.
"We're sorry for any inconvenience caused and we're working hard getting everything back up and running for you," it said.
It was not able to give an estimate for when the problem would be resolved. The BBC has approached NatWest for comment.
It is the latest in a long line of banking outages.
It emerged in May that 1.2m people were affected by them in the UK in 2024.