University of Waterloo students are on high alert after an alleged sexual assault on campus.

It happened in a parking lot located in the middle of a number of student residences Tuesday night.

Police say a woman was assaulted by two men.

The incident happened between 10 p.m. and 11 p.m.

The males are described as:

Suspect #1: male, white, 19-years-old, 5’6”, heavy build, wearing a red hat.

Suspect #2: male, non-white 19-years-old, 6’, black hair, slender build.

The men fled the area in an unknown direction.

Anyone who may have witnessed this assault are asked to contact Waterloo Regional Police Major Case Unit at 519-650-8500 ext. 8674 or Crime Stoppers at 1-800-222-TIPS (8477).