GLENDALE, Ariz. -- The Glendale Police Department is asking for the public's help solving three armed robberies.
Police said the robberies occurred at approximately 9 p.m. at a Dollar General store on May 15 and two Dollar Tree stores on May 17 and June 1.
Glendale police detectives believe the same suspect was involved in all three robberies.
In each incident, the suspect enters the business right before closing time and waits until he is one of the last customers. He then approaches an employee, displays a knife in his waistband and escorts the employee to the back office where he demands money from the cash drawers.
Before the suspect flees the scene, he tells the employee to stay in the office until he is gone.
Police have released surveillance video of the suspect.
The suspect is a white male, 5 feet 9 inches to 6 feet tall, with a thin build, facial hair, light brown hair and/or shaved head, and a tattoo on the left side of his neck. The suspect was wearing a long, blue button-down shirt, tie and jeans during the robberies.
Anyone with information on the suspect or these crimes is asked to call the Glendale Police Department at 623-930-3000 or Silent Witness at 480-WITNESS.