Citibank customers reported receiving a fraud alert and having difficulty accessing their accounts on Wednesday.

Numerous Citibank customers reported receiving fraud alerts and having difficulty accessing their accounts Wednesday. According to DownDetector.com, which tracks reports of digital services interruptions, hundreds of Citibank users had flagged issues related to their accounts as of midday.

Technical problems with Citibank's mobile app prevented users from accessing their accounts. The bank is attempting to fix the issue.

Hundreds of Citibank customers reported receiving fraud alerts and having difficulty log g ing into the app on Wednesday. The issues began around 9 a.m. ET with a spike of reports coming early in the afternoon, according to Down Detector.