RICHMOND, Va. -- Police are investigating an armed robbery that occurred on the campus of the University of Richmond Saturday night.

University police responded to the area of 470 Westhampton Way for a report of a robbery just after 10:45 p.m. A woman reported that an unknown man entered her apartment, displayed a handgun on his waist and then robbed her.

However, the initial investigation determined that the robbery was not random and that it resulted from a prearranged drug transaction between the two. Police say the suspect displayed what appeared to be a handgun during the transaction and fled with the drugs.

The suspect is described as a young African-American man between the age of 18 and 24, approximately 5 feet 11 inches tall and weighing between 170 and 190 pounds with dreadlocks pulled into a ponytail and light facial hair. He was last seen wearing a blue basketball jersey and dark blue or black cargo shorts with zippers along the legs.

Police have information that the suspect was seen on campus throughout the day Saturday asking students where to purchase marijuana.

This is an ongoing investigation and university police are asking anyone with further information related to this incident or who may have seen or interacted with the suspect on Saturday to contact them at 289-8715.

This is a developing story, so anyone with more information can submit a news tip here.