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.

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.

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

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.

All six are in stable condition after overdosing on a batch of cocaine that was possibly tainted during a party, Boulder Police said.

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

The Boulder Police Department is investigating after six college students were taken to the hospital after overdosing on possibly tainted cocaine at a party Saturday night.

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

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