AMHERST — University of Massachusetts Police are investigating a robbery in which suspects demanded driver’s licenses and money from four UMass students in Lot 13 on Olympia Drive Saturday evening.

A crime alert posted to the UMass Police website states that the incident occurred around 8 p.m. in the parking lot, which is a short distance from the Olympia Place Apartments building. The victims were allegedly approached by two men, one of whom was wearing a ski mask. No injuries were reported.

The students informed both UMass and Amherst police a short time after the incident.

The suspects, who left the area on foot, were not located.

UMass spokesman Edward Blaguszewski said Monday that no additional information was immediately available.

Classes at UMass for the spring semester resume Thursday.

Anyone with information about the incident should contact UMass Police at 545-2121 or make an anonymous report online via Anonymous Witness Form at umass.edu/umpd/anonymous-witness-form, or by calling the tip line at 413-577-TIPS.

— Scott Merzbach