Court documents say a retired Indianapolis fertility doctor used his own sperm to impregnate at least eight mothers decades ago and admitted to six now-adult children to doing so.

Dr. Donald Cline surrendered in court Monday and faces two felony obstruction of justice charges for misleading authorities who were investigating two of the children's complaints against him.

A probable cause affidavit says the 77-year-old suburban Zionsville man told the six adults that he had donated his own sperm about 50 times. His patients were told they were receiving sperm from medical residents or students.

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Cline is accused of being the biological father of at least eight people. The youngest would be about 30.

Cline's attorney is expected to release a statement Monday afternoon. He was released on his own recognizance.