By CBS 2 Chicago Staff

CHICAGO (CBS) — Police on Sunday issued an alert about a string of robberies in the Jefferson Park and Portage Park neighborhoods in recent days.

In each incident, the assailants have approached the victims on foot on bicycles while the victims have been walking in or near a city park. The assailants display handguns and announce a robbery, and then flee with the victims’ property.

READ MORE: Serial Stowaway Marilyn Hartman Found Fit To Stand Trial

The robberies have taken place at the following times and locations:

READ MORE: Closing Arguments Begin In Jussie Smollett's Trial For Allegedly Staging Phony Hate Crime; 'We Have Proven This By Overwhelming Evidence'

• At 11 p.m. Tuesday, July 13, in the 5300 block of West Berteau Avenue;
• At 12:40 a.m. Wednesday, July 14, in the 4600 block of North Milwaukee Avenue;
• At 7:30 a.m. Friday, July 16, in the 5300 block of West Wilson Avenue.

There are two suspects, both between 16 and 20 years old. They were wearing masks and dark clothing in each incident.

MORE NEWS: 71-Year-Old Man Shot Multiple Times, Killed While Heading To Store To Buy Newspaper In Chinatown

Anyone with information is asked to call Area Five detectives at (312) 746-7394.

CBS 2 Chicago Staff