WikiLeaks founder Julian Assange said last night that the "door is open" for talks to break the deadlock over his campaign to avoid extradition to Sweden.

He made a rare public appearance on a balcony at the Ecuadorian embassy in London to mark the six-month anniversary of his arrival at the building.

He has since been granted political asylum by the Ecuador government but has remained inside the embassy.

The Australian will be arrested if he steps outside as he has broken his bail conditions. He thanked his supporters, who stood in the street outside, some carrying lighted candles.

He said: "Six months ago I entered this building. It has become my home, my office and my refuge. Thanks to the principled stance of the Ecuadorian government and the support of its people, I am safe in this embassy and safe to speak from this embassy."

He said he had been sustained by the solidarity of people around the world supporting WikiLeaks and freedom of the press.

"While my freedom is limited, I am still able to work and communicate, unlike the 232 journalists who are in jail tonight."

Mr Assange is wanted for questioning in Sweden over allegations of sexual assault, which he denies.

He fears being sent to the US to be questioned over his whistle-blowing website.

He said the Pentagon claimed recently that the existence of WikiLeaks was an "ongoing crime".

He added: "The door is open for anyone who wishes to use standard procedures to speak to me or guarantee my safe passage."