STOCKHOLM (Reuters) – WikiLeaks founder Julian Assange, whose whistle-blowing website caused uproar last month with a leak of secret U.S. military files on Afghanistan, is wanted in Sweden on charges of rape and molestation, the National Prosecutor’s Office said Saturday.

Assange, whose whereabouts are unclear, denied the allegations on WikiLeaks’ Twitter page. “The charges are without basis and their issue at this moment is deeply disturbing.”

Assange, an Australian, was in Sweden last week to discuss his work and defend his intent to publish further documents on the war in Afghanistan. He has close contacts in the Nordic country, where WikiLeaks has said it keeps some of its servers.