LINCOLN SQUARE — Police are warning of robberies of businesses in the area, citing three cases where offenders with guns escaped with cash from registers.

The robbberies all occurred on Jan. 20th.

"In these casesm two offenders or three offenders entered the business, displayed a blue steel handgun and demanded money from the register," police said in an alert. "The offenders moved the victims to the rear of the store or into a storage area and took money, alcohol, cigarettes and other property."

The Jan 20th incidents occurred:

• 4900 block of north Damen Avenue at 7:53 p.m.

• 2500 block of west Lawrence Avenue aty 9:45 p.m.

• 4600 block of north Kedzie at 9:55 p.m.

Police describe the suspects in the first case as three black men, 19 to 22 years old, 5'8 to 5'10 and wearing dark clothes, gloves and a covering over their face. In the two other cases, the suspects are black men, 17 to 25, 5'6 to 5'8. They also wore dark clothing and gloves and had their faces covered, police said.

The Damen robbery was reportedly Windy City Liquors. Surveillance camera footage obtained by ABC7 showed the robbers storming into the business and overwhelming the clerk.

Brazen armed robbery caught on video in Ravenswood: https://t.co/gkhREaT252 pic.twitter.com/b8fAMz9C1T — ABC 7 Chicago (@ABC7Chicago) January 22, 2016

Police urge anyone who may have information about the crimes to contact the Bureau of Detectives - Area North at 312-744-8263.

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