The first seemingly random act of violence occurred in Chicago's Lakeview, Boystown neighborhood at the intersection of North Halsted Street and West Newport Avenue, around 10 p.m.
A black female, in the company of another person, attacked a white woman on the street, said police.
The female assailant's hair was styled in a ponytail and she was wearing a gray shirt and dark short pants.
The suspect and her company were last seen walking westbound on Newport Avenue.
About an hour later, another woman was attacked outside a Far North Side, Rogers Park gas station, said police.
Around 11 p.m., a woman was beaten outside the Mobil gas station at 7550 North Sheridan Road, near Sheridan and Howard Street.
Two black males in their 20s jumped the woman, punched her several times, and ran away, said police.
One suspect has a medium complexion and he is approximately 5'8" and 140 pounds. He was wearing a black hat, a black t-shirt, and khaki short pants.
The second offender has a light complexion with tattoos on his neck and arm. He is approximately 5'8" and 170 pounds.
At the time of this report, the motives for the attacks were unknown.
UPDATE: A second woman was attacked in Rogers Park.
Citing police dispatch reports, two men approached a woman from behind and choked her near the intersection of North Ashland Avenue and West Jonquil Terrance, around 11:40 p.m.
The suspects were described as "males from the neighborhood".
After the incident, the offenders fled the scene in a black, four-door Jeep Wrangler.