NatWest's online banking system has gone down, leaving several customers unable to make payments.
Users took to Twitter to complain about the lack of service.
Anybody else having trouble with #Natwest lack of online banking service?— Jonathan M. Ratcliff (@JRatcliff01) September 28, 2016
Anyone banking with NatWest today - they are having massive issues with their online banking— Danielle Slatter (@mouseslatter) September 28, 2016
Arg @NatWest_Help please sort your online banking issue.— Rebecca Brice (@Radiobex) September 28, 2016
Meanwhile, digital performance tracking website Downdetector said the bank had been experiencing issues since 14.48 this afternoon.
“We are aware that a small number of customers are experiencing issues making payments through online banking and we are working to get this resolved as quickly as possible," said a spokesman for NatWest.
"Our customers can still use our mobile app, visit our branches or use telephone banking as normal. We apologise to customers for the inconvenience.”
Millions of NatWest customers were left unable to access their funds because of a system failure in early 2015.
The bank is currently owned by Royal Bank of Scotland - in May the parent company was reported to be mulling a sale, although the group has since denied that it was seeking to dispose of NatWest.