Intelligence analyst Edward Snowden's latest claims surround Microsoft.
In documents leaked to The Guardian, the fugitive whistleblower said the computer giant allowed the FBI and other agencies to circumvent its encryption software.
Microsoft said that it only provides specific customer data in response to government demands.
Meanwhile The US has publicly criticised China for failing to hand over Edward Snowden.
The fugitive whistleblower was in Hong Kong when the first documents about a secret surveillance programme were released.
Authorities there allowed him to travel on to Russia - despite an American request to extradite him.