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The National Security Agency may have violated U.S. law for over a decade with the unauthorized surveillance of U.S. citizens'overseas communications, according to new reports on the agency's intelligence collection practices released by the NSA on Wednesday.

The U.S. spy agency released the highly confidential reports in response to a Freedom of Information Act lawsuit filed by the American Civil Liberties Union (ACLU).According to documents posted on the NSA website on Christmas Eve, the examples of violations include sending data on Americans to unauthorized recipients, storing such data on unprotected computers and retaining them after they were meant to be destroyed, according to Bloomberg.

In general, each NSA report contains similar categories of information, including an overview of recent oversight activities signals intelligence activities affecting certain protected categories; and descriptions of specific incidents which may have been unlawful or contrary to applicable policies, NSA said, on its website.

The reports include a series of quarterly and annual accounts that have been made available to the presidents Intelligence Oversight Board, Bloombergreported, adding that the reports cover the period between the fourth quarter of 2001 and the second quarter of 2013.

In one instance of an unauthorized surveillance practice, in 2012, an NSA analyst searched a U.S. organization in a raw traffic database without formal authorization because the analyst incorrectly believed that he was authorized to query due to a potential threat, according to the fourth-quarterreportfrom 2012. The surveillance found nothing suspicious.

Another report revealed an incident, also in 2012, when an analyst searched her spouses personal telephone directory without his knowledge to obtain names and telephone numbers for targeting. According to the report, the analyst was advised to cease her activities.

The ACLU, which filed the lawsuit to access the NSA reports, claimed that the intelligence information collected by the spy agency was sometimes misused.

The government conducts sweeping surveillance under this authority -- surveillance that increasingly puts Americans data in the hands of the NSA, Patrick C. Toomey, staff attorney with the ACLUs National Security Project, told Bloomberg in an e-mail. Despite that fact, this spying is conducted almost entirely in secret and without legislative or judicial oversight.

Meanwhile, the NSA said that it has multi-layered protections in place to ensure that no further errors occur in intelligence-gathering and retention.

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Reports Show Irregular Surveillance Of US Citizens