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The Rio de Janeiro-based columnist for Britain's Guardian newspaper said he has recruited the help of experts to understand some of the 15,000 to 20,000 classified documents.
Two security experts said they have figured out how to spy on Verizon Wireless mobile phone customers by hacking into devices the US carrier sells to boost wireless signals indoors.
Irate Latin American nations are demanding explanations from the United States about new allegations that it spied on both allies and foes in the region with secret surveillance programs.
The revelations of alleged US surveillance programmes based on documents taken by fugitive former National Security Agency contractor Edward Snowden have raised a political furore.
However the officials declined to specify what changes were spotted among militant groups.
The expanded surveillance says the Indian government will help safeguard national security.
Edward Snowden, 29, says he felt the US was building an unaccountable and secret espionage machine.
Senator Mark Udall says another look at the law is warranted as reports of data collection has stirred debate over privacy rights in the US.