The confrontation initially began early Thursday after the individual, who was clad in body armor, sought to break into the visitor's screening area inside the FBI's Cincinnati office; however, he ultimately fled the scene after being confronted by troopers.
"At approximately 9 AM this morning, an armed subject attempted to breach the Visitor Screening Facility at #FBI Cincinnati. After an alarm and a response by FBI special agents, the subject fled north onto Interstate 71," the FBI office in Cincinnati said via Twitter on Thursday.
Shots were exchanged between the suspect and the pursuing law enforcement units, prompting the authorities to implement a lockdown in a one-mile radius from the place of the incident, which included private businesses and residences, Clinton Co. Emergency Management Agency said in a statement.
The authorities also closed Interstate 71 in both the northern and southern directions and limited transit on State Route 73 between Mitchell Roads and State Route 380, the statement added.
Law enforcement shot and killed the suspect after attempts to take him into custody failed, Ohio State Highway Patrol Lt. Nathan Dennis said later on Thursday. Dennis explained that the suspect was shot after he raised a gun at the authorities.
The suspect’s identity has yet to be confirmed to the public, although law enforcement sources reportedly told US corporate media that police are aware of the person's identity.
The incident comes as federal officials have been warned about increased threats following the FBI search of former US President Donald Trump's Florida residence - Mar-a-Lago.