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Hackers have threatened to expose secret documents from the computer systems of a law firm, which they claim are related to 9/11.

The hackers, known as The Dark Overlord, say that the documents from Hiscox Syndicates will be released unless a hefty, yet undisclosed, ransom is paid.

While the nature of the documents remains unclear, the hackers claim that they could provide answers about 9/11 conspiracies.

They tweeted: “We'll be providing many answers about 9.11 conspiracies through our 18.000 secret documents leak from @HiscoxComms and others.”

(Image: AFP)

So far, the hackers have published a small set of letters, emails and documents that mention several law firms, as well as the Federal Aviation Administration and the Transport Security Administration.

The ransom note, which was first reported by Motherboard, included a 10 GB archive of files, which is encrypted.

However, the hackers say they’ll release decryption keys unless the ransom is paid.

It said: “Pay the f*** up, or we're going to bury you with this. If you continue to fail us, we'll escalate these releases by releasing the keys, each time a Layer is opened, a new wave of liability will fall upon you.”

A spokesperson for the Hiscox Group told Motherboard that it’s working with law enforcement on the matter.