Police released a photo of the suspects from surveillance footage during the Jan. 3 robbery in the 2700 block of West Harlem Ave. View Full Caption CPD News Affairs

CHICAGO — Police issued a warning after a string of convenience store robberies on the Northwest Side.

The four robberies occurred between Dec. 7 and Jan. 15. The most recent robbery occurred at 9:40 a.m. Jan. 15 in the 2900 block of North Pulaski Road in Belmont Gardens. The other robberies occurred at 1:25 p.m. Jan. 8 in the 2900 block of North Pulaski Road in Belmont Gardens at 9:12 p.m. Jan. 3 in the 2700 block of North Harlem Avenue in Belmont Cragin, and 3:20 a.m. Dec. 7 in the 6800 block of West North Avenue in Galewood.

During two of the robberies, two men entered the store and had a conversation with the store employee before walking behind the counter, suggesting they had a weapon and then taking cartons of cigarettes. In the other two robberies, a man entered the store and talked to the employee before taking out a handgun and demanding money from the register, police said.

In the North Avenue and Harlem Avenue incidents, the suspects are described as a white man between ages 28-35, 5-foot-10 to 6-foot-1, and 170-190 pounds. He was was wearing a black hooded sweatshirt and black jeans. The other suspect was a black man between ages 30 -36, 5-foot-10 to 6-foot-2, and 220-225 pounds. He was seen wearing a black jacket with a fur-lined collar and black jeans.

In the Pulaski Road incidents, the suspect is described as a white man with blonde hair, between ages 20 -30, 5-foot-8 or 5-foot-9, and 175 pounds. He was wearing a partial face mask, hooded green jacket and blue jeans.

Anyone with information is asked to call detectives at 312-744-8263.

For more neighborhood news, listen to DNAinfo Radio here: