WikiLeaks no longer has money to operate and may shut down by December if cash donations does not come in soon, its founder Julian Assange announced in a press conference in London on Monday.

Assange said he is trying to raise $3.3 million to continue the whistleblowing website, which has temporarily stopped publishing exposes. He blamed the money woes to the financial blockade imposed by Amazon, Bank of America, Visa, MasterCard, PayPal and Western Union.

The said companies refused to process donations for WikiLeaks in December after it published classified information about the wars in Afghanistan and Iraq, corporate malfeasance and thousands of sensitive U.S. State Department diplomatic cables, some of which bore unsavory remarks on heads and officials of governments. As a result, funding was cut off.

"The attack has destroyed 95 per cent of our revenue. If we do not get the funds flowing again, that is the end of WikiLeaks - that is the end," Assange told reporters at the Frontline media club, according to ABC.net.au.

Assange said he will take legal action against companies blocking funding in Australia, the U.S., the U.K. and other countries.

The past 11 months saw WikiLeaks using its reserve cash to fund operation. The website spends $300,000 each for security and campaigns, $400,000 for productions, $500,000 each for information, publications research and staff salaries, and $1.2 million in legal fees.

Assange is in London fighting extradition to Sweden, where he has been charged with sex crimes.