U.K. regulators are in close contact with Barclays PLC after an IT problem left thousands of customers locked out of their accounts for several days, according to people familiar with the matter.
The Prudential Regulation Authority and the Financial Conduct Authority have been speaking with Barclays, said the people, asking not to be named discussing non-public information.
After such incidents, the Bank of England expects the companies to identify causes and share their internal processes for dealing with what happened, according to a reference manual. Banks must also identify lessons and implement appropriate measures as a result.
Representatives for the PRA, which is part of the Bank of England, and the FCA declined to comment.
Barclays said in an online post on Friday that some customers were having trouble with the firm's app and online banking, and with payments in and out of their accounts. The bank also said it was unable to help over the phone or via its messaging service.
Friday was the deadline for U.K. tax returns as well as payday for many Britons. HM Revenue & Customs said it was working closely with Barclays to minimize the impact on those submitting self-assessments, the BBC reported.
By Sunday, Barclays said it had fixed the glitch. The company apologized, saying on its website it intended to put customers back in their original financial position.
"We are working on bringing balances up to date for some of our customers and addressing any outstanding issues," Barclays said in a statement on Monday. "Our call centers and branches are open, and we will be proactively contacting customers who may be vulnerable."
