Beyonce and Jay-Z perform during the "On The Run Tour"

Beyonce and Jay-Z perform during the "On The Run Tour: Beyonce And Jay-Z" at Minute Maid Park on July 18, 2014 in Houston, Texas.  

Larry Busacca/PW/WireImage for Parkwood Entertainment

Police in California arrested a man accused of groping a woman before biting her boyfriend's fingertip off during Beyonce and Jay Z's concert Saturday night at the Rose Bowl, the Pasadena Star-News is reporting. 

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According to Pasadena police, Roberto Alcaraz-Garnica sexually assaulted a woman in her 20s while attending the concert. A fight ensued after the woman's boyfriend confronted Alcaraz-Garnica, who "bit the victim, causing serious injury to his finger." Pasadena police Lt. John Luna said the boyfriend "lost the tip of one of his fingers."

Alcaraz-Garnica was arrested at about 10 p.m. on suspicion of sexual battery and mayhem and held on $100,000 bail pending his initial court appearance.

Also on Saturday, police arrested eight concertgoers for public drunkenness and two people for scalping.

Representatives for Jay Z and Beyonce have not commented on the spate of arrests at the concert, which drew an estimated 55,000 fans to the historic stadium for the couple's On the Run tour. A second Rose Bowl concert was set for Sunday night.