Authorities have learned a large group of teenagers may gather tomorrow to participate in what's described as "disruptive behavior".
The alert sent by police warns the teens plan to arriving at the Chicago and State intersection and gathering nearby at Chicago and Michigan avenues.
It's not the first time businesses on the Magnificent Mile have been targeted.
Some people who work on Michigan Avenue say they're aware of the threat.
"It's business as usual. I'm sure we'll have police officers outside of the store and just try to make the best of it. So hopefully nothing happens," store employee Jordin Filas said.
"Some kids steal. Some kids just cause trouble. I don't know what they're up to, but it's pointless. It really is," store employee London Winters said.
It all comes about a week after a melee broke out at Ford City Mall where officials say a group of 30 or so young people coordinated to cause trouble.
"You can't have a police officer on every corner but you can certainly let the community know what's going on in those corners and they can just be aware," ABC7 News Public Safety Expert and former CPD Superintendent Jody Weis said.
"It's like a mob scene, just jumping on cars, breaking windows," witness to the February Ford City Mall incident Moses Khativ said.
Though the area around Chicago and Michigan avenues is one of the safest in the city, the Chicago Red Line stop had the most crimes reported of any CTA location in 2012, according to police.
In June 2011 a series of mob attacks in the area made headlines.
In the summer of 2012, two doctors were beaten by a group of offenders in Streeterville after leaving work at the nearby medical campus.
After the lights parade in November 2012, a man was stabbed in a bathroom at the nearby Westin hotel.
Neighborhood resident Michael Gillespie says that in the summer of 2012 he was beaten and mugged at the corner of Michigan and Chicago avenues.
"I've never seen it like this now. It's just these kids don't care," he said. "They just don't care what they do to get whatever they want."