Provided conversations: Former NSA contractor Edward Snowden. Photo: Reuters

Washington: Ordinary internet users far outnumber legally targeted foreigners in the communications intercepted by the National Security Agency from US digital networks.

Nine out of 10 account holders found in a large cache of intercepted conversations, which former NSA contractor Edward Snowden provided to The Washington Post, were not the intended surveillance targets but were caught in a net the agency had cast for somebody else.

Many of them were Americans. Nearly half of the surveillance files, a strikingly high proportion, contained names, email addresses or other details that the NSA marked as belonging to US citizens or residents. NSA analysts masked, or "minimised", more than 65,000 such references to protect Americans' privacy, but nearly 900 additional email addresses were found unmasked in the files, which could be strongly linked to US citizens or residents.

There are discoveries of considerable intelligence value in the intercepted messages but also collateral harm to privacy on a scale that the Obama administration has not been willing to address.

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Among the most valuable contents whichthe Post didnot describe in detail, to avoid harm to continuing operations are fresh revelations about a secret overseas nuclear project, double-dealing by an ostensible ally, a military calamity that befell an unfriendly power and the identities of aggressive intruders into US computer networks.

Months of tracking communications across more than 50 alias accounts, the files show, led directly to the 2011 capture of Pakistan-based bomb maker Muhammad Tahir Shahzadand Umar Patek, a suspect in a 2002 terrorist bombing in Bali.

Many other files, described as useless by the analysts but nonetheless retained, have an intimate quality. They tell stories of love and heartbreak, illicit sexual liaisons, mental health crises, political and religious conversions, financial anxieties and disappointed hopes. The daily lives of more than 10,000 account holders who were not targeted are catalogued and recorded nevertheless.

About 160,000 intercepted email and instant message conversations were reviewed, along with 7900 documents taken from more than 11,000 online accounts.

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Nine out of 10 people in Edward Snowden's NSA intercepts were not targets

WASHINGTON - The Washington Post said on Saturday a study of a large collection of communications intercepted by the US National Security Agency showed that ordinary Internet users, including Americans, far outnumbered legally targeted foreigners caught in the surveillance. "Nine of 10 account holders found in a large cache of intercepted conversations, which former NSA contractor Edward Snowden provided in full to The Post, were not the intended surveillance targets but were caught in a net the agency had cast for somebody else," the Post said.

Nearly half of the files "contained names, email addresses or other details that the NSA marked as belonging to US citizens or residents," it said.

The paper said the files also contained discoveries of considerable intelligence value, including "fresh revelations about a secret overseas nuclear project, double-dealing by an ostensible ally, a military calamity that befell an unfriendly power, and the identities of aggressive intruders into US computer networks." Tracking the communications led to the capture of some terrorism suspects, including Umar Patek, a suspect in a 2002 bombing on the Indonesian island of Bali, it said.

Many other files were retained although, described as useless by analysts, they were about intimate issues such as love, illicit sexual relations, political and religious conversions and financial anxieties, the Post said.

The paper said it reviewed about 160,000 emails and instant-message conversations and 7,900 documents taken from more than 11,000 online accounts, collected between 2009 and 2012.

US intelligence officials declined to confirm or deny in general terms the authenticity of the intercepted content provided by Snowden to the Post.

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Ordinary people outnumber targeted foreigners in NSA data