CHICAGO — Robbers have struck seven times in West Town and Humboldt Park in less than a month, police said.

The robbers walked up to victims, demanded they hand over their items and sometimes used force, according to a Chicago Police community alert. They then got into a dark-colored car, possibly a Ford Fusion, and drove away.

The robberies occurred:

7:25-7:35 a.m. Dec. 25 in the 700 block of North Oakley Boulevard. The thief was described as an 18- to 22-year-old black man who was 5-foot-11, 150-170 pounds and had brown eyes, police said. He wore a black winter hat and black jacket.

5:45 p.m. Jan. 6 in the 2300 block of West Rice Street. The thief was described as an 18- to 20-year-old man who was 6 feet tall to 6-foot-2, 150-180 pounds and who had short, black hair, police said. He wore a black jacket. There was a second robber, but no description was available.

Midnight Jan. 17 in the 2600 block of West Thomas Street. Two robbers were described as 18- to 25-year-old black men who were 6 feet tall and 170-185 pounds, police said. One wore a black skull cap.

6:20 p.m. Jan. 17 in the 1000 block of North Rockwell Street. There were two robbers and one was described as a man in a black skull cap and black sweater, police said.

7:55-7:57 p.m. Jan. 19 in the 1000 block of North Rockwell Street. One robber was described as a 22-year-old man in a black jacket and the second robber was described as a 22-year-old man in a black overcoat, police said.

8:15 a.m. Monday in the 2200 block of West Rice Street. One robber was described as a 27- to 30-year-old black man who was 6 feet tall, 190 pounds and had brown eyes and medium-length black hair, police said. A second robber was described as a 27- to 30-year-old man.

7:18 p.m. Tuesday in the 2100 block of West Iowa Street. The robber was described as a 20- to 25-year-old man who was 6-foot-2 to 6-foot-4 and 180-200 pounds, police said. He wore a black skull cap, black waist-length coat, black pants and beige boots.

Anyone with information about the robberies was asked to call police at 312-747-8380.