The suspect was believed to be armed with an AR-15 rifle and a nail gun, a federal law enforcement source told CNN, and was wearing body armor, according to officials in an Ohio county.
He was Ricky W. Shiffer, 42, of Columbus, the state highway patrol said Friday.
After attempting to enter the FBI facility, he fled and his vehicle was followed by state police, authorities said. When the vehicle pursuit ended in southwestern Ohio, a lengthy standoff followed, ending with law enforcement shooting and killing the suspect, according to authorities.
The FBI is investigating the circumstances that led to the suspect being shot, the bureau said.
While authorities have not announced a motive, the FBI is investigating the man’s social media presence and whether he had ties to right-wing extremism, a federal law enforcement source told CNN.
Authorities have not confirmed the account belongs to the suspect, though a law enforcement source told CNN an image on the account matched a government ID photo of him.
Here’s what we know about the attempted breach and the suspect:
What happened when the suspect tried to enter the office
At about 9:15 a.m. ET Thursday, an armed man tried to breach the visitor screening facility at the FBI field office, the agency said.
“Upon the activation of an alarm and a response by armed FBI special agents, the subject fled northbound onto Interstate 71,” FBI Cincinnati said in a statement.
Ohio State Highway Patrol troopers responded and found the suspect at an interstate rest stop in a Ford Crown Victoria at around 9:37 a.m., the patrol said.
The troopers tried to initiate a traffic stop on the suspect, but he fled and a vehicle pursuit ensued, highway patrol spokesman Lt. Nathan Dennis said. Shots were fired from the suspect’s car during the chase, he said.
The suspect exited the highway at state Route 73 in Ohio’s Clinton County — roughly a 45-mile drive northeast of downtown Cincinnati — and came to a stop on a road nearby around 9:53 a.m., the highway patrol said.
How the standoff unfolded
After stopping, the man got out and “engaged officers,” the highway patrol said. Gunfire was exchanged between law enforcement and the suspect, who used his vehicle for cover, they said.
The standoff stretched for several hours as law enforcement tried to negotiate with the suspect, the highway patrol said.
“Once negotiations failed, officers attempted to take the suspect into custody by utilizing less lethal tactics,” the agency said. “At approximately 3:42 p.m., the suspect raised a firearm and shots were fired by law enforcement officers.”
The suspect was shot and died from his injuries on the scene, the agency said.
It is unclear what less lethal tactics authorities used as they tried arrest him.
What we know about the suspect
The FBI is investigating Shiffer’s social media presence and whether he had ties to right-wing extremism, a federal law enforcement source told CNN.
The post was made minutes after the Ohio State Highway Patrol said the incident at the office in Cincinnati began, shortly after 9:15 a.m.
“Well, I thought I had a way through bullet proof glass, and I didn’t,” the user posted at 9:29 a.m. Thursday. “If you don’t hear from me, it is true I tried attacking the F.B.I., and it’ll mean either I was taken off the internet, the F.B.I. got me, or they sent the regular cops while.”
It’s unclear whether the user was attempting to write more, as the post stops after, “while.”
The FBI declined to comment on the account and its postings, citing an ongoing investigation.
“People, this is it,” the user wrote on Monday. “I hope a call to arms comes from someone better qualified, but if not, this is your call to arms from me.”
In that post, the user encouraged people to go to gun and pawn shops to “get whatever you need to be ready for combat.”
When another person responded to the user saying they would be sending his photo and information to the FBI, the user responded by saying, “Bring them on.”
It’s unclear whether the information was forwarded to the FBI.
On Tuesday, the user wrote people were heading to gather in Palm Beach, Florida — where Mar-a-Lago is located — and said if the FBI broke up the group, “kill them.”
How the FBI has responded
FBI headquarters is investigating the “agent-involved shooting,” the agency said. The agency has deployed a Shooting Incident Review Team to the scene, which is standard practice when an FBI special agent or task force officer discharges a weapon, a law enforcement source told CNN.
The review team will gather evidence, interview witnesses and ultimately determine whether the use of deadly force was justified, the source said.
“The FBI takes all shooting incidents involving our agents or task force members seriously,” a bureau statement reads. “The review process is thorough and objective, and is conducted as expeditiously as possible under the circumstances.”
FBI Director Christopher Wray released a statement Thursday evening condemning attacks on law enforcement and the FBI.
“Unfounded attacks on the integrity of the FBI erode respect for the rule of law and are a grave disservice to the men and women who sacrifice so much to protect others. Violence and threats against law enforcement, including the FBI, are dangerous and should be deeply concerning to all Americans,” Wray said.
CNN’s Evan Perez, Jason Hanna, Michelle Watson, Caroll Alvarado, Chuck Johnston and Dakin Andone contributed to this report.