LONDON (Reuters) -- WikiLeaks website founder Julian Assange is in Britain and police know his whereabouts but have refrained so far from acting on an international warrant for his arrest, a British newspaper said on Thursday. A spokesman for WikiLeaks said Assange had faced assassination threats and had to remain out of the public eye. The 39-year-old Australian, who founded the whistle-blowing website that has disclosed a trove of US diplomatic cables, gave British police contact details when he arrived in the country in October, The Independent said. The newspaper cited police sources who said they knew where Assange was staying and had his telephone number. It added that it was believed he was in southeast England. The release of sensitive diplomatic cables has angered the United States who have vowed to shut down such activities. Speaking at an event in London on Wednesday night, WikiLeaks spokesman Kristinn Hrafnsson said Assange was working on the project at a secret location. "When you have people calling for his assassination, it is best to keep a low profile. This is inciting violence. And apparently it is unlawful in some countries," he said. NOMADIC EXISTENCE The international police agency Interpol this week issued a "red notice" to assist in the arrest of Assange, who is wanted in Sweden on suspicion of sexual crimes, but Britain's Serious Organized Crime Agency (Soca) so far has refused to authorize this, the paper said. Citing unnamed sources, the ...