"Late last night we gathered all the information and sent it out in the different systems," namely the Swedish system, Schengen countries system SIS and Interpol, Tommy Kangasvieri of the Swedish National Criminal Police (Rikskriminalpolisen) told AFP on Saturday.
"The prosecutor had already decided to issue an international arrest warrant, we made sure that all the police forces in the world would see it," Kangasvieri explained.
Interpol, based in Lyon in eastern France, later said it had received an arrest warrant for the extradition of Assange.
The Stockholm district court on Thursday ordered an arrest warrant for Assange, a 39-year-old Australian, for questioning on "probable cause of suspected rape, sexual molestation and unlawful coercion" in Sweden in August.
The court order allowed prosecutor Marianne Ny, who had requested Assange's detention, to prepare an international arrest warrant for the head of the whistleblowing website, who is believed to be in Britain.
Ny insisted Thursday that arresting Assange was the only way she could be sure of questioning him about the allegations, which he has denied.
Assange's Swedish lawyer Björn Hurtig on Friday filed an appeal against the arrest warrant court order, but the appeal did not suspend the Swedish order or delay the international warrant.
However, Swedish media reported the petition would likely be treated quickly by the appeals court, which could rule on the warrant's legitimacy in days.
Assange has been accused of raping one woman in Sweden and sexually molesting another.
He has strongly denied the charges and hinted that they could be part of a "smear campaign" against his whistleblower website for publishing classified US documents on the wars in Iraq and Afghanistan.
WikiLeaks last month published an unprecedented 400,000 classified US documents on the Iraq war and posted 77,000 secret US files on the Afghan conflict in July.