Major US financial firms JP Morgan Chase and the Bank of America have been targeted by a distributed denial of service (DDoS) attack, according to one hacktivist group.
The European Cyber Army has claimed it waged the attack that disrupted online services for customers of the companies between 10:30am and 2:30pm on Tuesday (28 January).
It is the latest in a long line of DDoS attacks that the group has admitted to, with the federal court system one organisation recently impacted.
Reports suggest the group have also been responsible for disruptive online attacks in Asia, the Middle East and Europe.
Both the Bank of America and JP Morgan Chase has refused to comment on the attack, but customers took to Twitter to complain about the outage to online services.
Several executives at organisations that track DDoS activity confirm they saw indications two leading US banks were hit on Tuesday.
The news of the DDoS attacks comes as Aleksandr Panin, the Russian programmer who created the SpyEye bank hacking tool, was successfully prosected in the US.