US whistleblower promises more revelations due

The US government is considering whether to charge Edward Snowden with leaking classified surveillance secrets, while it defends the spy programme it says keeps America safe from terrorists.

Facing a global uproar over the operations that track phone and internet messages around the world, the Justice Department continued to investigate whether the disclosures of Snowden, 29, an employee of government contractor Booz Allen Hamilton, were criminal.

The journalist who exposed the surveillance programmes said that there will be more “significant revelations” to come from the documents.