LOS ANGELES (AP) — A prosecutor says former Los Angeles County Undersheriff Paul Tanaka and a sheriff's captain are subjects of a wide-ranging federal obstruction-of-justice probe of the department.

The Los Angeles Times reports the revelations about Tanaka, who is running for sheriff, and Capt. William Carey, were made Monday during a trial for the first of 20 low-ranking sheriff's officials charged in an ongoing investigation into excessive force and corruption at county jails.

Neither Tanaka nor Carey has been indicted.

Both men were witnesses in the trial of Deputy James Sexton. Under questioning, Tanaka said he is aware he is a subject of the probe.

Sexton's attorneys are using Tanaka's testimony to argue that their client was merely following superiors' orders when he hid a jail inmate prepared to testify on alleged jail abuse from federal authorities.