Three businesses were robbed at gunpoint within one hour Thursday night on the Northwest Side.

In each incident, a male walked into the business, displayed a chrome or silver-colored handgun and demanded money from the register, according to a community alert from Chicago Police.

The first robbery happened about 7:30 p.m. in the 2700 block of West Montrose, police said. The second happened at 8:10 p.m. in the 5000 block of North Cicero. The third occurred at 8:30 p.m. in the 5300 block of North Milwaukee.

The suspect is described as a 16-to-25-year-old black male between 5-foot-7 and 5-foot-10, weighing 130 to 160 pounds, police said. He was wearing a white T-shirt, blue jeans, a baseball cap and gym shoes.

Anyone with information about the robberies is asked to call Area North detectives at (312) 744-8263.