LOS ANGELES (AP) — At least seven current and former Los Angeles County sheriff's deputies have been arrested by the FBI as part of an ongoing investigation of inmate abuse in the nation's largest jail system.

A law enforcement official with direct knowledge of the arrests who wasn't authorized to speak publicly and requested anonymity confirmed the arrests were made Monday by federal agents.

Federal authorities called a news conference Monday afternoon to announce criminal corruption and civil rights charges filed in the case.

The FBI has been investigating allegations of excessive force and other misconduct at the county's jails since at least 2011.

A Sheriff's Department spokesman says he's aware of an indictment but refers calls to the FBI.

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