JPMorgan Chase (JPM)'s online banking faltered on Tuesday afternoon, preventing customers from logging on to their accounts.
The nation's largest bank by assets took to Twitter at roughly 3:00 p.m. Eastern to say the website was "experiencing intermittent issues."
Online banking at JPMorgan Chase remained down roughly three hours later, while the bank urged customers to use the company's mobile banking, which continued to function, or to visit an ATM or branch.
The outage, follows a similar interruption that occurred in February, is the result of a denial of service attack, Chase confirmed Tuesday night.
On Tuesday afternoon, the website Sitedown.co, which tracks outages, logged roughly 107 reports of people being unable to log in to their accounts at JPMorgan Chase within the preceding 24 hours compared with 112 reports in the past seven days.
The outage at JPMorgan Chase also follows a warning Tuesday by the al-Qassam Cyber Fighters, a group that has claimed responsibility for a series of attacks that have slowed websites at some of the nation's biggest banks, that the group is targeting JPMorgan Chase, Bank of America, Citibank (NYSE:C), PNC Financial (PNC), Fifth Third Bancorp (FITB), Union Bank, BB&T (BBT) and Capital One (COF) for another round of assaults.