A federal judge has ordered R&B singer R. Kelly held in a Chicago jail without bond on sex crime charges.

U.S. District Judge Harry Leinenweber handed down the ruling Tuesday after Kelly was arrested last week and charged in Chicago and New York with sex crimes including having sex with minors and trying to cover it up.

Kelly, wearing an orange jumpsuit and shackled at the ankles, did not speak except to say "yes sir" when the judge asked if he understood the charges. His attorney, Steve Greenberg, submitted a not guilty plea.

Prosecutors argued that Kelly would be an extreme risk if released, especially to minors, and that he might flee.

The 52-year-old singer was arrested Thursday night while walking his dog on a 13-count indictment that includes sex crimes and obstruction of justice. A federal indictment was also unsealed in New York Friday that charges him with racketeering and sex-related crimes.

Prosecutors say the defendants paid hundreds of thousands of dollars to victims and witnesses to make sure they wouldn't cooperate with law enforcement. It also accuses Kelly of using physical abuse, violence and blackmail to prevent victims from providing evidence to law enforcement.

The singer has denied wrongdoing.

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