Two women and a man were exiting the drug store, located at 2648 West Dempster Street, around 9:17 p.m. when they were approached by a male suspect with a gun tucked into his waistband, according to a statement from Park Ridge police.
Police said the suspect then took a purse from one of the women before running to a vehicle waiting for him nearby.
The suspect entered the front passenger seat of a tan-colored 4-door sedan with tinted windows, according to police. It then fled the parking lot of the business and was last seen heading east on Dempster Road, police said.
Police said the suspect was wearing a mask and glasses, a tan-colored hooded sweatshirt, tan pants and black shoes.
Anyone with information is asked to contact the Park Ridge Police Department at 847-318-5256.