The FBI has been illegally obtaining information on the US public, a report by the justice department's inspector general has said.
The FBI used the Patriot Act, passed after the 11 September 2001 attacks, to compel the release of information illegally or improperly, it said.
It said most of the errors were through poor record-keeping or agent mistakes rather than criminal misconduct.
The errors were "unacceptable" and would be corrected, the FBI said.
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