Isis-supporting Twitter account leaks spreadsheet showing 'details of military and Foreign Office employees'

It is not clear how old the details are, whether they are valid, or whether they are genuine

Isis claim to have leaked the email addresses of military and political workers (AHMAD AL-RUBAYE/AFP/Getty Images)

A spreadsheet that apparently reveals the names, email addresses and passwords of hundreds of government and military workers has been released online, through a Twitter account claiming to be run by an Isis supporter.

As reported by Sky News, the spreadsheet shows the details of Foreign Office workers and a British council employee - although most of the personal information relates to people within Nasa, the US armed forces and the New York and New Jersey Port Authority.

A message at the top of the spreadsheet reads: "O Crusaders, as you continue your aggression towards the Islamic State and your bombing campaign against the Muslims, know that we are in your emails and computer systems, watching and recording your every move."

It is not yet known how old the information is, or whether it is valid.

The link to the data was reportedly first posted by Neil Prakash, who goes by the name Abu Khaled al-Cambodi, a well-known Australian Isis recruiter.

Accounts that spread the spreadsheet are shut down by Twitter, but the company is unable to prevent new ones from springing up.

The leak came as it was revealed that security for the VJ Day celebrations in London would be stepped up after reports of a possible terror threat.

World War Two veterans parade past the Whitehall cenotaph on VJ Day 2010 (AFP/Getty) (CARL DE SOUZA/AFP/Getty Images)

The Queen and other members of the Royal Family are set to take part in the day's events, which will commemorate the end of World War Two.

The review came after the Mail on Sunday reported that a threat was being made against the Queen.