Wells Fargo is working to fix a widespread outage preventing some customers from using the mobile app and accessing their online banking accounts.
When attempting to log in online, some customers are met with a screen that says: "We're experiencing some technical difficulties. We apologize for the inconvenience as some of our web pages are temporarily unavailable."
Wells Fargo addressed the outage on social media.
"We apologize to our customers who may be experiencing an issue with our online banking and mobile app. Thanks for your patience while we research this issue. If you are impacted, please check back here for updates," Wells Fargo wrote on Twitter.
The bank sent out a follow-up tweet about an hour later with another apology: "We're experiencing a systems issue that is causing intermittent outages, and we're working to restore services as soon as possible."
Smoke at one of Wells Fargo's data centers the caused the outage, the bank Tweeted later on Thursday.
CNBC reported that the incident happened at a data center in Shoreview, Minn., at around 5 a.m. CST and was under control starting at 9 a.m.
Twitter users complained about not being able to access the bank's website and app.
"It’s too early in the morning for Wells Fargo to be ruining people’s lives. Mobile app ... down. Website account access... down. Account access by phone... down. Folks cards are getting declined. ATMs are screwed up. I’m almost shamed to admit that I still bank with them," Twitter user @SeventyElle wrote.
"#wellsfargo you guys can have the worst service in tough times. No online banking available right now!! Anyone else with the same issue?" Twitter user @rohitcs wrote.
"I’ll accept your apology but please be aware that I charge a banking fee for this type of inconvenience. So Wells Fargo now owes me $150," Twitter user @Gratefulfred wrote.
Follow Consumer Tech Reporter Dalvin Brown on Twitter: @Dalvin_Brown