Barclays customers have been left unable to make payments or check their balances due to an online banking outage.
The bank said that "a small number" of customers have been affected by a technical error - with the lender's mobile app and online services still down at midday on Monday.
Twitter users started reporting problems at around 9.50am, saying that they were unable to access their accounts.
"Barclays your online banking is down on pay day. What on earth is going on. Can't call you either as lines not working. Shocking service," one user wrote online.
Another said: "Hey Barclays your online banking has been down for the last 24 hours.. trying to pay some outstanding bills."
Meanwhile, Down Detector - which collates information on major outages - said there were reports of an outage at around 9.44am.
Barclays said: "A small number of our customers are having problems logging in to their online banking and making payments on online banking and in the Barclays app.
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"We apologise for this and are working to fix it as soon as possible."
The bank said it is working to fix the issues, and has advised customers to try again if they are having trouble getting into their accounts.
Customers can also use the app, contact Barclays through its automated telephone banking services or speak to the bank on the phone.
It said customers should not repeat any payments that have failed to go through as this could result in multiple transactions once the service resumes.
The bank advised customers to wait at least four hours until trying again.
