CHICAGO (CBS/AP) — A prosecutor has told a federal judge in Chicago that more charges and more defendants could be added to the case against R&B singer R. Kelly that alleges child pornography and other crimes.

Angel Krull said Thursday that a more far-ranging indictment could replace the initial indictment charging Kelly and two associates. She didn’t elaborate.

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The defendant, whose full name is Robert Sylvester Kelly, faces charges in Chicago accusing him of producing and receiving child pornography, obstruction of justice, and coercing minors to engage in sex. The 52-year-old is being held without bond and wasn’t at Thursday’s hearing. He faces related charges in New York.

Krull also asked for an order protecting evidence and limiting what attorneys can say publicly about the evidence, saying Kelly’s fans have harassed potential witnesses.

Defense attorney Steve Greenberg said the proposed order is too restrictive. Another hearing is set for Wednesday.

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Two of R. Kelly’s associates have already been charged with him.

The Chicago indictment accuses Kelly and former manager Derrel McDavid of conspiring to cover up videotapes Kelly allegedly made of himself sexually abusing children. Another Kelly employee, Milton “June” Brown, faces child pornography charges for allegedly helping ship videotapes of Kelly’s sexual crimes in the U.S. mail.

McDavid and Brown have pleaded not guilty.

Kelly has been ordered held without bond.

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