WASHINGTON — Navy Federal Credit Union customers were unable to access their accounts online or via the credit union’s mobile app Wednesday.

Navy Federal said Wednesday morning that it was experiencing an outage online and on the mobile app, and that it was working to get everything up and running as soon as possible, with no timetable given.

The second outage in as many months generated dozens of angry comments on social media from frustrated customers.

Shortly before 3 p.m., Navy Federal updated members by Twitter, saying account access was available online and through the mobile app, but account information was still not available by phone or through a branch.

In an emailed statement Wednesday night, a Navy Federal spokesman told WTOP, “Earlier today our members were unable to access their accounts due to a system outage. We worked hard to restore services, which are back up and running at this time. We know this has been frustrating for our members and apologize for the disruption in service.”

On Dec. 20, the credit union confirmed it was experiencing delays in direct deposits after customers found empty account balances and were unable to contact customer service call centers. Navy Federal corrected the problems by lunchtime that day.

Vienna, Virginia-based Navy Federal is the largest credit union in the world, with more than $79 billion in assets, nearly 300 branches and 6 million members. It has more than 15,000 employees worldwide.