ATLANTA - A former federal prison doctor has been charged with sexually abusing inmates.

The U.S. Attorney's office in Atlanta says Dr. Lewis Jackson appeared in court Thursday and was released on bond. He was indicted last week on three counts of sexually abusing a ward and one count of lying to federal agents.

A lawyer for Jackson could not immediately be located.

Prosecutors say the 30-year-old Lewis worked at the federal penitentiary in Atlanta from January 2011 through last month. They say he tried to perform sex acts on three male inmates in October 2011.

Jackson was charged last week in superior court in Washington, D.C., with three counts of sexually abusing another inmate there in 2008. He was out on bond in that case when he was arrested in Atlanta.