Citing documents provided by former NSA contractor Edward Snowden, The Washington Post said that nearly half of those surveillance files contained names, email addresses or other details that the NSA marked as belonging to US citizens or residents.
The paper said the spy agency masked, or 'minimised', over 65,000 such references to protect Americans' privacy, but it found nearly 900 additional email addresses that could be strongly linked to US citizens or residents.
"Months of tracking communications across more than 50 alias accounts, the files show, led directly to the 2011 capture in Abbottabad of Muhammad Tahir Shahzad, a Pakistan- based bomb builder, and Umar Patek, a suspect in a 2002 terrorist bombing on the Indonesian island of Bali," it said.
The paper said it was withholding other examples at the request of CIA as it would compromise ongoing operations.
The Post reviewed roughly 160,000 intercepted e-mail and instant-message conversations, some of them hundreds of pages long, and 7,900 documents taken from more than 11,000 online accounts.
The material spans President Barack Obama's first term, from 2009 to 2012, a period of exponential growth for the NSA's domestic collection.
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