US whistleblower Edward Snowden 'defending liberty' 10 June 2013 Last updated at 12:42 Ed Snowden explains why he became a whistleblower (Video courtesy of The Guardian, Glenn Greenwald and Laura Poitras) An ex-CIA employee has said he acted to "protect basic liberties for people around the world" in leaking details of US phone and internet surveillance. Edward Snowden, 29, was revealed as the source of the leaks at his own request by the UK's Guardian newspaper. Mr Snowden, now believed to be in Hong Kong, said he had an "obligation to help free people from oppression." A spokesman for the US Office of the Director of National Intelligence said the case had been referred to the Department of Justice as a criminal matter. You will never be safe The Guardian quotes Mr Snowden as saying he flew to stay in a hotel in Hong Kong on 20 May, though his exact whereabouts now are unclear. He is described by the paper as an ex-CIA technical assistant, currently employed by Booz Allen Hamilton, a defence contractor for the US National Security Agency (NSA). Mr Snowden told the Guardian: "The NSA has built an infrastructure that allows it to intercept almost everything. With this capability, the vast majority of human communications are automatically ingested without targeting. If I wanted to see your emails or your wife's phone, all I have to do is use intercepts. I can get your emails, passwords, phone records, credit cards. I don't want to live in a society that does these sort of things... I do not want to live in a world where everything I do and say is recorded. That is not something I am willing to support or live under. He told the paper that the extent of US surveillance was "horrifying," adding: "We can plant bugs in machines. Once you go on the network, I can identify your machine. You will never be safe whatever protections you put in place. US media response A USA Today editorial accepts that "the primary result of Snowden's actions is a plus. He has forced a public debate on the sweepingly invasive programs that should have taken place before they were created. But, it goes on, "pure motives and laudable effects don't alter the fact that he broke the law." An editorial in the Chicago Tribune argues that "some new restrictions" in the US intelligence gathering programme may be in order, adding: "If the government is looking for, say, calls between the United States and terrorists in Pakistan or Yemen, why can't it simply demand records of calls to certain foreign countries. Is there no way to narrow the search to leave most Americans out of it? Robert O'Harrow in the Washington Post writes that the growing reliance on contractors in US intelligence gathering "reflects a massive shift toward outsourcing over the past 15 years, in part because of cutbacks in the government agencies." He argues that this "has dramatically increased the risk of waste and contracting abuses... but given the threat of terrorism and the national security mandates from Congress, the intelligence community had little choice." Mr Snowden said he did not believe he had committed a crime: "We have seen enough criminality on the part of government. It is hypocritical to make this allegation against me. Mr Snowden said he accepted he could end up in jail. "If they want to get you, over time they will," he said. He said he also feared the US authorities would "act aggressively against anyone who has known me. That keeps me up at night. Mr Snowden said he had gone to Hong Kong because of its "strong tradition of free speech." Hong Kong signed an extradition treaty with the US shortly before the territory returned to Chinese sovereignty in 1997. However, Beijing can block any extradition if it believes it affects national defence or foreign policy issues. A standard visa on arrival in Hong Kong for a US citizen lasts for 90 days and Mr Snowden expressed an interest in seeking asylum in Iceland. However, Hong Kong's South China Morning Post quoted Iceland's ambassador to China as saying that "according to Icelandic law a person can only submit such an application once he/she is in Iceland." On Monday, one of the Guardian journalists who broke the story, Glenn Greenwald, told reporters in Hong Kong that Mr Snowden was content with his actions. "I mean, he's a human being, I'm sure he's fearful, but he's not like petrified with fear, I get the sense that he's very at peace with the choice that he made," said Mr Greenwald. Core values In a statement, Booz Allen Hamilton confirmed Mr Snowden had been an employee for less than three months. Guardian journalist Ewen Macaskill: "He's been planning this for a couple of years" "If accurate, this action represents a grave violation of the code of conduct and core values of our firm," the statement said. The first of the leaks came out on Wednesday night, when the Guardian reported a US secret court had ordered phone company Verizon to hand over to the NSA millions of records on telephone call "metadata." Major US security leaks Pentagon papers, 1971: Daniel Ellsberg leaks study showing the government had knowledge it was unlikely to win Vietnam war Watergate, 1972: Bob Woodward and Carl Bernstein reveal extent of cover-up over burglary at Democrat National Committee HQ Iran-Contra affair, 1986: Iranian cleric reveals illegal US arms sales to Iran, the proceeds of which are later used to fund Nicaraguan Contras Valerie Plame, 2003: Ms Plame is revealed to be an undercover CIA agent, ending her covert career Abu Ghraib, 2004: Publication of pictures showing abuse of detainees at Iraq prison by US officials turns initial media reports of abuse into full-blown scandal Bradley Manning, 2010: The soldier downloads thousands of classified documents from military servers and hands them over to Wikileaks Prism is said to give the NSA and FBI access to emails, web chats and other communications directly from the servers of major US internet companies. Mr Clapper's office said all the information gathered under Prism was obtained with the approval of the secret Foreign Intelligence Surveillance Act Court (Fisa).