(CBS) — Students at the University of Illinois-Chicago are on alert after a weekend robbery involving two suspects.

It happened early Sunday in the 1400 block of West Lexington Street, just off the UIC campus.

A UIC student reported a couple of men robbed him of his cell phone around 1 a.m. before fleeing. One of the two suspects said he had a gun, the robbery victim told police.

One suspect was wearing a Bulls cap and a denim jacket with red seams; the other had braids and was wearing a black hooded sweatshirt.

Police are warning people to travel in groups, especially at night.

The victim was not injured. Anyone with information is asked to call UIC police at (312) 996-2830.

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