Update (5:17 p.m. Nov. 3): All four people have been identified. Click here for more information.

URBANA – Police are looking for a number of people involved in a pepper-spraying incident Monday evening on the Quad.

Just after 6 p.m. Monday, a U. of I. student told police that she was approached by a group of women, one of whom pepper-sprayed the student for no apparent reason just south of the Illini Union, 1401 W. Green St., Urbana. The student was not seriously injured.

The women ran west toward Wright Street from the Quad.

Witnesses said the offender was in a group of four women, all of whom were observed on security cameras. The images are posted here, and police are hoping members of the public may recognize any of the women. (Update: A juvenile offender has been identified and the images were removed to protect the identity of the juvenile).

Anyone with information can contact the University of Illinois Police Department at 333-1216. Witnesses may remain anonymous by calling Crime Stoppers at 373-TIPS (8477), or by visiting www.373tips.com. All calls to Crime Stoppers are electronically scrubbed of all caller ID information and answered by a third-party service, not the police.

There are no prohibitions against pepper spray on campus, and campus community members may carry it in case it is needed for defensive use. It is, however, considered a weapon and may not be used in a manner other than self-defense.