AMHERST - University of Massachusetts police are seeking a suspect involved in a reported sexual assault Tuesday night in the W.E.B. Du Bois Library.

The assault allegedly took place in the women's bathroom on the library's 19th floor between the hours of 10 and 11 p.m.

The suspect is a white male in his 20s or 30s, according to UMass police. He is 5 feet, 6 inches tall with brownish, dirty blonde hair, wearing a gray sweatshirt and blue jeans.

Anyone with information is asked to contact the UMass police detective bureau at 545-0893, or the TIPS hotline at 577-TIPS (8477). People may also provide information via the department's Anonymous Witness form, which can be found at www.umass.edu/umpd.anonymouswitness.