R&B singer R. Kelly was arrested Thursday in Chicago on federal sex trafficking charges. Law enforcement sources told CBS News he was arrested by the New York Police Department and federal Homeland Security agents.

The U.S. Attorney's Office in northern Illinois said Kelly is facing 13 counts, including child pornography, enticement of a minor to engage in criminal sexual activity and obstruction of justice. As CBS News correspondent Jericka Duncan reports, this is the first time Kelly has faced federal criminal charges.

He is facing two separate federal indictments, one in northern Illinois and one in New York. The New York Eastern District was expected to file racketeering charges on Friday.

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U.S. Attorney's Office spokesman Joseph Fitzpatrick said Kelly was apprehended at about 7 p.m. Chicago time and was being held by federal authorities. According to the Federal Bureau of Prisons, Kelly was being held at the Metropolitan Correctional Center in Chicago.

Darrell Johnson, Kelly's publicist, told CBS News the singer's team had been expecting federal charges, and they're ready to fight them.

"Mr. Kelly has a lot of fans, people praying for him, wishing him the best. The best outcome is for him to be out -- that's what we all hope," Johnson said.

R. Kelly facing "decades" behind bars

Kelly has already been charged with over 20 counts of sexual abuse. He was first charged in February with 10 counts of sexual abuse involving four women, some of them minors. In May, he was charged with an additional 11 felony counts, including some that carry a maximum sentence of 30 years in prison.

The charges in May stemmed from accusations from Jerhonda Pace, whose allegations were recounted in the Lifetime docu-series called "Surviving R. Kelly."

In an explosive interview with "CBS This Morning" co-host Gayle King in March, Kelly insisted none of the allegations against him were true, including accusations that he had has beaten, starved and held other women against their will -- a so-called "sex cult."

"Believe me, man! This is not me! They lying on me! They're lying on me! I'm cool, bro," he said standing and screaming.

The Gayle King Interview with R. Kelly

News of Kelly's arrest on Thursday was first reported by NBC News.