June 24 (Reuters) - Citigroup Inc said on Friday it was working to fix a technical issue, after customers took to social media to complain that they could not access their accounts remotely.

"We are working to resolve a technical issue and appreciate your patience," Citigroup's customer service Twitter account said in replies to multiple complaints.

Bloomberg reported the news first.

A Bloomberg reporter spoke with four people at a bank branch on Manhattan's Upper East Side who said debit cards did not work at the ATM there. (http://bloom.bg/296tSVr)

Citigroup was not immediately available for further comment.

(Reporting by Anya George Tharakan in Bengaluru; Editing by Sandra Maler)