Police are warning residents of two recent robberies reported at parks in the Loop.
In each incident, a large group of people surrounded someone in a park and took possession of their belongings by force, Chicago police said.
The first robbery was reported about 7:20 p.m. May 21 in the 200 block of East Randolph, police said. The second happened about 9:45 p.m. May 26 in the 1100 block of South Michigan Avenue, police said.
The group is made up of males and females between 14 and 20 years old, according to police.
Anyone with information is asked to call Area Three detectives at 312-744-8263.