The Guardian Journalist Glenn Greenwald who exposed the secret U.S. surveillance programs revealed by the National Security Agency Contractor warned of more "significant" leaks in the coming weeks.
"We are going to have a lot more significant revelations that have not yet been heard over the next several weeks and months," said Glenn Greenwald Tuesday, according to the Associated Press.
The journalist's reports last week based on the NSA whistleblower Edward Snowden's information revealed NSA's program of monitoring phone calls and internet activities of millions of people. The government agency accessed data of major internet companies. The 29-year-old Edward Snowden said that he leaked the information because his 'conscience' goaded him to protect the "basic liberties" of people across the world.
Greenwald said that decision was being made on when to expose the next breaking story.
The journalist also said that the Guardian didn't publish high-sensitive materials that may put lives of secret agents at risk or help other countries improve their eavesdropping.
"We've published these things they marked 'top secret' that don't actually harm national security but conceal what they've done from the public," said Greenwald.
Speaking on MSNBC's "Morning Joe" on Monday, the journalist said "What we disclosed was of great public interest, of great importance in a democracy, that the U.S. government is building this massive spying apparatus aimed at its own population."
"There are dozens of stories generated by the documents he provided, and we intend to pursue every last one of them," he said.
The NSA whistleblower, who initially was staying in a hotel in Hong Kong has gone "missing" since Monday according to local media. His disappearance comes in the wake of a possible extradition demand by the U.S. government.
Former Hong Kong's top security official, Regina Ip Lau Suk-yee, advised Snowden to leave the city citing an extradition treaty that the Hong Kong government has signed with the U.S. government, AFP reports.
"If Mr Snowden is in Hong Kong and if the US justice department decides to initiate criminal investigation and if the offence comes in the purview of our agreement, they could through the US consulate ask our law enforcement agencies to assist in locating him ... and possibly even arresting him," said Regina Ip.
"He may not have known that the US has signed treaties with us ... so it's best he leave," she said.