The problem affected customers using web browsers as well as the Wells Fargo mobile app.
Wells Fargo customers who tried to visit the bank's website Thursday morning found an ominous message instead of the usual online banking login screen. For instance, it said consumer credit card and mortgage balance weren't yet working.
Some customers reported that their cards were declined while attempting a purchase, and some said they couldn't pay their bills on time because of the glitch.
Wells Fargo has dealt with a string of controversies in recent years. "We apologize for the inconvenience", the bank posted to Twitter Thursday morning.
For some customers, the Thursday outage evoked a sense of deja vu, as Wells Fargo experienced similar issues a week ago.
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"We want our customers to know that this is a contained issue affecting one of our facilities, and not due to any cybersecurity event or attack". Wells said it was still working to restore services.
The US giant took to Twitter at about 9am EST to confirm an "issue", promising to research.
We reached out to Steve Carlson, a VP of Corporate Communications for the region that includes Iowa, and he released the exact same information from Wells Fargo's second tweet.
The company tweeted that the problems started after smoke at one of its facilities, and that the outage wasn't the result of a cyber-attack.