A massive police response near Grant Park has blocked lanes of DuSable Lake Shore Drive Tuesday.
According to Total Traffic, police activity is blocking the two left turn lanes on the northbound side of the roadway near the intersection of DuSable Lake Shore Drive and Monroe Drive.
Traffic is backed up all the way to Roosevelt Road due to the police activity, according to the website.
There was no immediate word on what led to the massive response near the park, and an investigation remains underway.
We will update this story with details as they become available.