Police in Boulder are now backtracking on their claim that over the weekend a group of University of Colorado students overdosed on cocaine that was possibly tainted with fentanyl.

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.

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

Coming off a troubling weekend in which six young men got ill at a fraternity party, there's renewed talk about the dangers of drug contamination at the University of Colorado in Boulder.

In an update Tuesday, the Boulder Police Department walked back its claim that University of Colorado Boulder students overdosed on a possibly tainted batch of cocaine over the weekend.

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

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

Police are investigating after several students were sickened at a college party in Boulder.