A group of partiers on the roof of a Cornell frat house allegedly taunted black students and threw objects — including an empty Jack Daniels bottle — at them as they passed on the street.

Beverly Fonkwo, a sophomore, says she and a friend were walking home when people began throwing things at them from the Sigma Pi roof. When she confronted the crowd, she says, they threw more trash and a full beer can, saying “come on up here, Trayvon” and making other racist remarks.

The president of the fraternity, Zach Smith, told the Cornell Daily Sun on Sunday that the frat had “figured out who the perpetrator was, and will turn his name over to police.” Smith claimed that only one person was involved in the attack, and that the perpetrator was not a member of the fraternity.

Cornell’s Sigma Pi chapter was suspended for a year in early 2008 as a result of an underage drinking incident that sent four first-year students to the hospital.