Officers responded to a call of gunshots fired at federal agents Saturday amid immigration enforcement operations in Chicago that drew residents to protest in the streets, authorities said.

There were no reports of anyone being hit by gunfire, according to police, and the Department of Homeland Security stated that shots were fired by a man in a black Jeep who was targeting the agents. The suspect and the vehicle have not been located, according to DHS.

Tensions are high as federal enforcement has grown increasingly aggressive, some two months into an immigration operation in Chicago dubbed Operation Midway Blitz. Some residents have protested, at times confronting heavily armed agents directly.

A federal judge issued an extensive injunction this week restricting agents’ use of force, citing that a top Border Patrol official had repeatedly misled about the threats posed by protesters.

Saturday’s operation in Little Village, a predominantly Mexican neighborhood, attracted demonstrators who blew whistles, honked car horns, and shouted at agents to leave. Some even confronted police officers they perceived as complicit in the federal enforcement efforts.

During the protests, one police vehicle had its taillight smashed and windshield damaged. DHS reported that some protesters threw paint cans and bricks at agents’ vehicles. U.S. Customs and Border Protection did not immediately respond to a request for comment.