Founder of WikiLeaks Julian Assange was arrested by British police on Tuesday over sexual assault claims in Sweden.

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Officers from Scotland Yard detained the 39-year-old Australian at about 0930 GMT after he voluntarily went to a police station in central London, according to Britain's Sky news. Britain has received a European arrest warrant from Sweden on Monday.

Two women in Sweden accused Assange of sexually attacking them when he visited the country in August, but Assange denied the claims.

Assange is expected to appear at City of Westminster Magistrates' Court later.

His lawyer Mark Stephens said his client wants to find out what allegations he faces so he can clear his name.

Stephens said "It's about time we got to the end of the day and we got some truth, justice and rule of law ... Julian Assange has been the one in hot pursuit to vindicate himself to clear his good name."

Assange has said that he declined to return to Sweden to face prosecutors because he feared he would not receive a fair trial.

Over the last week, his website has revealed hundreds of secret American diplomatic documents. British Foreign Secretary William Hague said publishing details of sensitive sites, including some in Britain, could make them become the targets attacked by terrorists.

On Monday, Prime Minister David Cameron's national security adviser also ordered all government departments to provide assurance about the quality of IT security.