(Reuters) - Fugitive former U.S. spy contractor Edward Snowden controls dangerous information that could become the United States' "worst nightmare" if revealed, a journalist familiar with the data said in a newspaper interview.

Glenn Greenwald, the Guardian journalist who first published the documents Snowden leaked, said in a newspaper interview published on Saturday that the U.S. government should be careful in its pursuit of the former computer analyst.

"Snowden has enough information to cause harm to the U.S. government in a single minute than any other person has ever had," Greenwald said in an interview in Rio de Janeiro with the Argentinean daily La Nacion.

"The U.S. government should be on its knees every day begging that nothing happen to Snowden, because if something does happen to him, all the information will be revealed and it could be its worst nightmare."

http://www.reuters.com/article/2013/07/13/us-usa-security-snowden-g...