ATF officials said their agents were conducting a sting operation along a stretch of Kentucky Street when they "were ambushed." A shootout ensued.
One agent was shot in the chest and the arm and transported to Broadway Methodist Hospital for treatment.
An official told ABC7 Eyewitness News he was listed in critical condition. The ATF tweeted Friday morning that the agent's condition had stabilized.
Thoughts and prayers for the @ATFHQ Chicago Field Office agent who was shot and critically wounded in Gary, Indiana. ATF Agents are working with us every hour of every day to reduce gun violence in Chicago and it's beyond a partnership, it's one team, one fight. pic.twitter.com/MYVrxM3PsB— Chicago Police (@Chicago_Police) June 7, 2018
The agent fired back, killing one of the suspects. The Lake County Coroner identified him as Raymon Truitt, III, of Gary.
"I saw that guy with the blanket covering him and that whole scene," said Marcus Miner, neighbor.
Another is in custody, officials told ABC News.
There was a heavy police presence at 8th Avenue and Kentucky Street, and a large area was closed to traffic.
The agency tweeted that it was responding to the shooting at about 1 p.m.
Conspiracy dropped from complaint against 3 correctional deputies in death of inmate. Still facing homicide and assault under authority.— David Louie (@abc7david) September 8, 2015
Chopper 7HD was over the scene of a crash in the area that may have been related to the incident. An ATF spokeswoman later told ABC7 Eyewitness News that the three car crash was not related to the shooting.