Wells Fargo blames power shutdown for nationwide outage affecting thousands of users

American multinational financial services company Wells Fargo & Company is displayed on a smartphone

'We're experiencing a systems issue that is causing intermittent outages, and we're working to restore services as soon as possible, ' the firm added in a follow-up tweet.

"We're experiencing system issues due to a power shutdown at one of our facilities, initiated after smoke was detected following routine maintenance", the company wrote on Twitter.

Customers of Wells Fargo nationwide have been reportedly unable to use their online banking or mobile app services early Thursday morning. 'Thanks for your patience while we research this issue'.

An hour after the initial tweet, the company said they were experiencing a "systems issue" and apologized for the inconvenience, but did not say how long systems would be down.

Starting around 6am Pacific Time (2pm UTC), the American bank's online portal and its mobile application have been totally unusable.

Wells Fargo did not answer questions about when the apparent outage might be resolved and whether the outage was impacting in-branch banking and ATM machines.

The issues are the direct effect "of a fire at a server farm located in Shoreview, Minnesota". The employee said the outage could last until Friday.

It is unknown how many Wells Fargo customers were impacted.