President Donald Trump and Homeland Security Secretary Kristi Noem in Florida on July 1, 2025

Thirteen Chicago police officers were exposed to tear gas deployed by federal agents Tuesday during a protest in the Brighton Park neighborhood, highlighting growing tensions between local and federal law enforcement agencies.

The incident occurred when individuals began throwing objects at federal agents. In response, the Chicago Police Department reported that federal agents deployed tear gas into the street. As a result, 13 of their own officers were exposed to the chemical agent.

According to CNN, at 11:07 a.m., Chicago police received a call about an auto accident involving federal officials. The police department says it was not part of any federal operation but responded to document the crash and manage traffic.

Additional CPD supervisors later arrived to support traffic control and crowd management.

A crowd of protestors gathered near the scene as federal agents prepared to leave. According to police, people in the crowd began throwing rocks at the agents.

This is the second recent incident in which Chicago police officers say they were affected by chemical agents deployed by federal law enforcement.

In a prior event, 27 CPD officers reported exposure. In response to that earlier event, the city’s police superintendent held talks with federal counterparts over how future operations should proceed.

The Chicago mayor’s office says representatives are on site gathering information. The Chicago Police Department says it is working to de‑escalate the situation and ensure public safety.

The investigation is ongoing.