Someone fired shots at CBP agents as they conducted an immigration enforcement operation on Chicago's Southwest Side on DHS said.

The incident involving Border Patrol Commander Greg Bovino, has been a key part of the court proceedings challenging immigration tactics in Chicago.

Border Patrol Commander Gregory Bovino's account of the timing when he got hit in the head by a rock was questioned by the judge.

A federal judge issued a preliminary injunction restricting the use of force by federal agents in Chicago, finding the Trump administration’s version of recent events involving agents was not credible.

Police are searching for a man they said opened fire at U.S. Border Patrol agents in Chicago on Saturday. (Credit: WFLD)

Following the incident, DHS head Kristi Noem denied a request from Democratic Illinois Gov. JB Pritzker to pause ICE raids for Halloween.

Instead of carefully targeted arrests long practiced by the U.S. Immigration and Customs Enforcement, President Donald Trump’s administration has deployed roving groups of masked Border Patrol agents,

DHS defended Border Patrol agent's actions in violent Evanston arrest, citing assault and groin grabbing by suspect after car collision in Illinois suburb.