Boulder police said five men were treated at the scene or taken to the hospital, and one of them — whose prognosis initially had been “grave” — remained hospitalized Tuesday.

Six University of Colorado students overdosed on tainted drugs over the weekend, according to the Boulder Police Department.

Boulder police are investigating after six men overdosed on a potentially tainted batch of cocaine at the Kappa Sigma fraternity house Saturday night.

Police are investigating after at least six students overdosed on a "possibly tainted batch of cocaine" at a fraternity house.

At least six members of the Kappa Sigma fraternity were sick and/or overdosing on Saturday, according to Boulder police. Narcan was administered to at least some of them, either at the hospital or at the fraternity house on Pennsylvania Avenue.

An investigation is underway after six college students overdosed on potentially tainted drugs at a fraternity party.