As the investigation continues into an incident in which a group of people allegedly hurled bottles and racial epithets at black students from the roof of the Sigma Pi fraternity house, the fraternity said that the attacker was not a brother of the house.

The allegations that a high-ranking Ithaca Police Department officer aided drug dealers stem from lawsuits that claim IPD racially discriminates against white officers — a crucial context that defenders of the embattled officer say has been missing from public discussions of the controversy.