BOULDER, Colo. (CBS4) - The Boulder Police Department is asking for the public's help to identify a person accused of taping white envelopes to the front doors of sorority and fraternity houses.

Investigators said each envelope contained a CD with audio from the Criminal Minds television show.

Police said the envelopes were taped to the doors around 1:30 a.m. on Monday. Officers are investigating to determine if criminal charges apply.

Anyone with information about the incident is asked to call the Boulder Police Department at 303-441-3333 reference case 21-1367.

Tipsters can also remain anonymous by calling the Northern Colorado Crime Stoppers at 1-800-222-TIPS (8477) or visiting crimeshurt.com.