WikiLeaks founder Julian Assange has been refused bail by a British court after he was arrested over allegations of sex crimes in Sweden.

Gemma Lindfield, for the Swedish authorities, told the court Mr Assange was wanted in connection with four allegations.

She said the first complainant, Miss A, said she was victim of 'unlawful coercion' on the night of 14 August in Stockholm.

The court heard Mr Assange is accused of using his body weight to hold her down in a sexual manner.

The second charge alleged Mr Assange 'sexually molested' Miss A by having sex with her without a condom when it was her 'express wish' one should be used.

The third charge claimed Mr Assange 'deliberately molested' Miss A on 18 August 'in a way designed to violate her sexual integrity'.

The fourth charge accused Mr Assange of having sex with a second woman, Miss W, on 17 August without a condom while she was asleep at her Stockholm home.

Mr Assange, who appeared pale but calm in the dock, confirmed his name and date of birth at the request of the court clerk.

There was confusion over his address as he asked whether it was 'for correspondence or for some other reason'.

Mr Assange, who was accompanied by officials from the Australian High Commission, eventually gave an address in his native country.

The one-hour court hearing came just hours after Mr Assange was arrested by appointment when he attended a central London police station.

A European Arrest Warrant issued by the Swedish authorities was received by officers at the Metropolitan Police extradition unit last night.

An earlier warrant, issued last month, was not valid as officials had failed to fill in the form properly.

Australian Prime Minister Julia Gillard slammed the publication of leaked confidential diplomatic cables by WikiLeaks as 'grossly irresponsible,' saying the information was gathered through an 'illegal act.'

Pressed on what Australian laws had been broken by WikiLeaks or Mr Assange, Ms Gillard said federal police were investigating and would advise her 'about potential criminal conduct of the individual involved'.

'The foundation stone of WikiLeaks was an illegal act,' Ms Gillard told reporters in Canberra.

'Let's not try top put any glosses on this, information would not be on WikiLeaks had there not been an illegal act undertaken.'