At least one man was in custody after a U.S. Drug Enforcement Administration special agent suffered a head injury and a broken leg when he was hit by a suspect's car in the Ashburn neighborhood of Chicago Sunday afternoon, police said, reports the Chicago Tribune .

Police were called to the area of 8200 block of South Kedzie Avenue following a report of shots fired about 12:50 p.m., and found that a law enforcement officer had been injured during a drug investigation when he was hit by a suspect's vehicle, according to Police News Affairs.

Federal agents and officers assigned to work with the DEA were acting on information that a driver was transporting cocaine and stopped a vehicle as it entered a gas station, according to a release from the Chicago Field Division of the DEA. When they tried to arrest the driver, he took off from the gas station, hitting a DEA special agent who was on foot in the area, according to the release and a DEA spokesman.

Shots were fired during the incident, and a suspect was being treated at a hospital, according to the DEA release. The agent was believed to have been the one who fired the shots, according to police.

The agent, who is in his 40s, was intentionally hit by a car and suffered head trauma, but his condition was stabilized at Christ Medical Center, police said, citing preliminary information.

The suspect fled north from the scene of the attack.