An Islamic organisation has threatened to launch debilitating cyber-attacks on the websites of major US banks, reports Fox Business.
The Izz ad-Din al-Qassam Cyber Fighters posted on a message board earlier in the week, threatening to target the websites of JP Morgan Chase, Bank of America, US Bancorp, PNC Financial Services and SunTrust Banks.
"In a new phase, the wideness and the number of attacks will increase explicitly; and offenders and subsequently their governmental supporters will not be able to imagine and forecast the widespread and greatness of these attacks," wrote al-Qassam.
The group has previously claimed responsibility for similar attack on US banks made earlier in the year.
A spokesperson for Bank of America is said to be "aware of the reports of possible cyber-attacks" and is monitoring its systems which it claims are "fully operational". However, there have been reports that the bank's website was intermittently offline earlier in the week.
PNC is also said to be aware of the proposed attack, while JP Morgan and SunTrust have declined to comment.
The proposed cyber campaign is thought to be further punishment for the anti-Muslim video, "The Innocence of Muslims", which was posted on YouTube in September and sparked widespread protests across the Middle East.
In recent months, al-Qassam has launched a spate of cyber-attacks against a slew of US banks. The attacks have generally involved a denial-of-service making website intermittently inaccessible. Others have involved so-called 'botnet', compromised web servers, carrying out high-level attacks.
Although the identities of the members of al-Qassam have not yet been revealed, there is speculation that the group is linked to Palestinian government organisation, Hamas.