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Hacking group Anonymous has announced a cyber-attack war against the Bank of England and New York Stock Exchange.

The organisation - made up of international hackers - warned of a series of attacks against the world's central banks over the next month.

In a new YouTube video - called Shut Down the Banks - it said its main targets would be the Bank of England and New York Stock Exchange.

It said these financial institutions help to ensure that the world's most powerful organisations and governments maintain their secrecy and remain in power.

A voice on the video says of the Bank of England and New York Stock Exchange: "They feel comfortable in their ivory towers built on the broken backs of labourers of the world.

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"......It is time to show the world the true power and the true face of the faceless.

"The powers that be have flown to close to the sun and the time has come to set the wings of their empire ablaze and watch the system their power relies on come to a grinding halt and come crashing down around them.

...."This time our target is the New York Stock Exchange and Bank of England.

"This is a call to arms, brothers."

The warning comes after the group targeted Greece's central bank with a cyber attack which disrupted its website.

In the video, the group said: "Olympus will fall. A few days ago we declared the revival of operation Icarus."

(Image: Getty)

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"Today we have continuously taken down the website of the Bank of Greece," the statement continued.

"This marks the start of a 30-day campaign against central bank sites across the world."

A Bank of Greece official today confirmed the attack.

A spokesman said: "The attack lasted for a few minutes and was successfully tackled by the bank's security systems.

"The only thing that was affected by the denial-of-service attack was our web site."

Anonymous originated in 2003, adopting the Guy Fawkes mask as their symbol for online hacking. The mask is a stylized portrayal of an oversized smile, red cheeks and a wide moustache upturned at both ends.

Hacktivists linked to Anonymous recently launched a "war" against the Ku Klux Klan.

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Two weeks ago, The Mirror exclusively revealed that hacktivists had launched a new campaign against the KKK by clobbering their main website with a digital blitzkreig called a DDoS attack.

A hacker using the name Ghost Squad has taken down a page run by the Loyal White Knights of the Ku Klux Klan at the address www.kkkknights.com.

"We believe in free speech but their form of beliefs is monolithic and evil," the hacktivist told HackReads.

"We stand for constitutional rights, but they want anyone who is not Caucasian removed from earth so we targeted the KKK official website to... send a message that all forms of corruption will be fought.

"They are the fascists and they are the racists.”