Online hacktivist collective Anonymous has lent its support to a global campaign to simultaneously occupy the major financial centres of London, New York, Madrid, Paris and other cities on 17 September in peaceful protest.

Anonymous tweeted from its @anonops account with the hashtag 'OCCUPYWALLSTREET' and linked to a poster urging its followers to assemble at the financial heart of the US, with the caveat: "Bring Tent."

The S17 campaign was kick started by anti-consumerism organisation Adbusters, which claims that it is "surging ahead internationally".

"Simultaneous occupations of financial districts are now being planned in New York City, Madrid, Milan, London, Paris and San Francisco. With a bit of luck, this list of participating cities will expand," Adbusters said in a blog post.

"If we can pull together just the right mix of non-violence, tenacity and strategic smarts, S17 could be the beginning of the global revolution we've all been dreaming about for so long ... wouldn't that be lovely."

Anonymous also released a video urging its followers to join the peaceful protest, stating that "the abuse and corruption of corporations, banks and governments ends here".

The campaign is another example of the online group becoming increasingly involved in offline methods of protest, most recently evidenced by its support for a protest against the tactics of the San Francisco Bay Area Rapid Transport (Bart) agency.

As part of its continuing efforts Anonymous posted semi-naked pictures of a man claimed to be Bart spokesperson Linton Johnson alongside his personal mobile number and email address.

"If you are going to be a dick to the public, then I'm sure you dont mind showing your dick to the public.... Umad Bro? #Bartlulz," said the accompanying text.