A robbery happened May 21 and another took place the next day.
Police are warning residents about a couple of robberies reported this month in McKinley Park and South Loop.
A group of people entered a business and took cellphones by force or threatening force in both cases, according to a community alert from Chicago police.
A robbery happened about 11:44 a.m. May 21 in the 3100 block of South Ashland Avenue, police said. Another took place about 12:12 p.m. the next day in the 2100 block of South China Place.
The suspects are described as three to four males.
Anyone with information should call Area Central detectives at 312-747-8382.