On Thursday (July 11), R. Kelly was arrested on federal sex crime charges. Now more details are emerging surrounding the booking.

On Saturday (July 13), TMZ reported the Feds have discovered 20 sex tapes that involve Kelly and underage females, leading to the arrest. According the report, most of these tapes were handed over by people who were previously part of the singer's entourage and inner circle. Law enforcement sources tell the site the videos feature multiple victims. The females in the videos are confirmed by witnesses to have been underage when the tapes were recorded.

Kelly was taken into custody in Chicago by NYPD detectives and Homeland Security Investigators on federal sex crime charges earlier this week. The 13-count indictment includes charges of child pornography, enticement of a minor and obstruction of justice, sex trafficking and more. According to the indictment, authorities believe Kelly and his team traveled the country "to recruit women and girls to engage in illegal sexual activity with Kelly."

An underage sex tape was at the head of Kelly's trial in the mid-2000s. He was eventually acquitted of the charges in 2008.

These new charges are separate from the crimes Kelly was hit with in May, when he was arrested and charged with sexual abuse and other related crimes. Kelly could face 30 years in prison for each count of the aggravated criminal sexual assault if found guilty.

Kelly entered a not-guilty plea in relation to the most recent charges. He is expected to remain in jail until his next court appearance on Tuesday (July 16).

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