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.

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

University of Colorado Boulder students on Monday reacted to the news that six students were given Narcan after overdosing on drugs that were tainted.

Police are investigating after six college students overdosed Saturday night on potentially tainted drugs at a Kappa Sigma house party.

Boulder police are backtracking on their claim that a group of University of Colorado students overdosed on drugs laced with fentanyl.

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.