Julian Assange, founder of WikiLeaks, holds a news conference at the Geneva Press Club in Geneva, in this November 4, 2010 file photograph. The US State Department's top lawyer urged Assange in a letter on Nov 27, 2010 to keep classified documents off the website, remove records of them from its database and return any material to the US Government. [Photo/Agencies]

LONDON - Interpol issued a "red notice" on Tuesday to assist in the arrest of Julian Assange, founder of the whistle-blowing website WikiLeaks, who is wanted in Sweden on suspicion of sexual crimes.

Assange, a former computer hacker now at the centre of a global controversy after WikiLeaks released a trove of classified US diplomatic cables at the weekend, denies the Swedish allegations.

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The website of Interpol, the international police agency, said anyone with information on the Australian-born Assange, 39, should contact their national or local police.

Red notices allow arrest warrants issued by national police authorities to be circulated to other countries to facilitate arrests and help possible extradition.

Assange's current whereabouts are not known and he is believed to move from country to country.

A Swedish court on November 18 ordered the detention of Assange. The prosecutor's office had started an investigation into allegations of rape, sexual molestation and unlawful coercion against Assange in September.

Assange's lawyer, Bjorn Hurtig, told journalists after the hearings he expected a European arrest warrant would be issued for Assange, who had sometimes visited Sweden in the past, and that he would probably appeal.

Assange has called the allegations baseless and criticised what he has called a legal circus in Sweden, where he had been seeking to build a base in order to benefit from its strict journalist protection laws.

WikiLeaks has angered the United States by releasing more than 250,000 State Department cables exposing the inner workings of US diplomacy, including brutally candid assessments of world leaders.

WikiLeaks had in October released nearly 400,000 classified US files on the Iraq war, which Assange said showed 15,000 more Iraqi civilian deaths had occurred than thought.

Wikileaks founder Julian Assange speaks during a news conference at the Frontline Club in central London, July 26, 2010. [Photo/Agencies]