(Reuters) - JPMorgan Chase ( JPM ) said it is working to restore service to automated teller machines (ATMs) affected by a global digital outage while a majority of its ATMs are operating normally, according to an emailed statement on Friday.

The largest U.S. bank declined to comment on how many of its ATMs were offline. It has 16,000 ATMs across the U.S. and 4,800 branches.

Financial firms were among many snarled by a global digital outage on Friday that caused hourslong disruptions to computer systems at hundreds of companies.

Bank teller stations were not working at at least two JPMorgan ( JPM ) branches in New York, according to employees at different locations who declined to be identified discussing the outage. Both employees said they were unsure when their computers would be restored.

Branches have remained open, and at the sites affected by the outages, customers were able to access banking services by making manual transactions with tellers or using ATMs, a source familiar with the situation said.