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.

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

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