Nearly 3,000 violations of Americans’ privacy, mentioned in the National Security Agency’s internal audit recently leaked by former contractor Edward Snowden, weren’t “willful” and are results of mistakes by employees, the agency claimed.

The NSA's director of compliance, John DeLong, has held a conference call with reporters Friday as the agency has made the most direct effort to counter concern over its spying activities since its classified documents began appearing in the press.



“NSA has a zero tolerance policy for willful misconduct,” DeLong is cited as saying by the Wall Street Journal. “None of the incidents that were in the document released were willful.”



However, he admitted that there was “a couple” of willful privacy violations during the past 10 years, but didn’t provide any details of those incidents.



According to DeLong, the NSA had about a 0.0005 percent error rate, with roughly 100 mistakes out of 20 million queries a month.



“No one at NSA thinks a mistake is OK, but those kinds of reports are designed and generated to make sure we understand when mistakes occur," DeLong said.



The explanations followed the publication of Snowden-leaked NSA’s internal audit report on privacy violations in The Washington Post on Thursday.



That document analyzed the different types of violations of policy or law for the year ended March 2012. The majority of the 2,776 breaches came from cases when the NSA continued monitoring foreigners through their cellphone use after they already left the United States.



The audit report said such violations were “largely unpreventable,” attributing the wave of "roamer" incidents to an increase in Chinese citizens visiting their American friends for Chinese New Year celebrations.



The document also speaks of one episode of mishandling telephone data as the NSA found out of more than 3,000 records being retained past their five-year expiration date.DeLong claimed that the call records were deleted right after they were discovered, and that they hadn't been reviewed by the agency’s analysts.Anothermentioned in the audit, occurred when an individual remained under surveillance even after obtaining a US Green Card, without the NSA having an individualized warrant to continue its spying activities on the person.Improper granting of access to a sensitive database was also among the breaches documented in the internal audit.The Washington Post reported a separate problem, when the NSA said that it had collected data on aof phone numbers in Washington DC because the system was incorrectly set to the 202 area code instead of the 20 country code, which is Egypt.Another document the paper published revealed a serious constitutional violation by the agency as it established a collection program for 'Multiple Communications Transactions,' which was deemedby the Foreign Intelligence Surveillance Court.NSA's director of compliance said that he couldn't describe the scope of that violation on the issue, but once again repeated that itThe collection later resumed under new court-approved procedures, he added.Answering The Washington Post’s complaint that the audit hadn't been made available to Congress, DeLong said the NSA provided this type of data to lawmakers and agencies with oversight responsibilities.Despite this specific document being designed for internal use, its results were incorporated into other reports provided to US lawmakers, DeLong said.The Senate Intelligence Committee, overseeing the surveillance programs, said itBut the some congressmen believe they aren’t getting enough information on the NSA activities, demanding a public debate on the surveillance programs.Democratic Senators Ron Wyden and Mark Udall said in a joint statement.In a White House statement Friday, deputy press spokesman Josh Earnest insisted that the violations didn't reflect intentional law-breaking by the NSA, and that the detailed report showed that the agency was pro-actively monitoring its own work.he said.US President Barack Obama also fended off attacks on the surveillance programs conducted by the NSA during a press conference earlier this month.Obama said.But leaked audit report is bringing the US president’s claims into doubt that Americans' privacy rights were safeguarded and violations by the NSA were only a possibility.