DALLAS — The Federal Bureau of Investigation finished processing the crime scene outside of the Earle Cabell Federal Building and Courthouse late Tuesday after 22-year-old Brian Clyde died during a shootout with Federal Protective Service officers.
According to the FBI, Clyde fired on the Cabell building early Monday morning and exchanged gunfire with the guards at the employee entrance.
Video of the shooting appears to show Clyde fire inside the building from the outside. Wearing tactical gear, he runs from the building and across Jackson Street before collapsing in the parking lot.
Clyde had a rifle and more than five 30-round magazines on him, said FBI Special Agent in Charge Matthew DeSarno.
As of Tuesday night, FBI agents are still searching for a motive. Officials said Clyde wasn't on their radar prior to the shooting.
Officials with The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), told WFAA Tuesday that the agency had successfully traced where Clyde obtained his weapon and that the FBI was looking into if it was a clean sale.
The Cabell building reopened Tuesday for employees only. On Wednesday, it will reopen to the public.
Up close, evidence tape marked where bullets dug into the building outside.
Some cars even took damage.
Federal employees and any potential jurors who parked in the parking lot where Clyde died were seen returning to retrieve their cars Tuesday night.
That included Robert Davis.
Davis was on the first floor of the building for jury selection when the gunfight began.
"They picked the first 13 jurors, took them out the door, and they were almost to the door when we heard one 'pop'," Davis said. "There were probably 8 to 10 and then there was a rapid burst of the rest."
"All of a sudden everyone who went out that door came running back in, there were probably 70 to 75 of us."
Davis said that he, staff, and other jurors took cover in the room they were inside. He added that it was fairly clear there was an active shooter.
"The main thing was, 'Let's get everyone in the room, let's get all the doors closed, and not worry about what we can’t control,'" Davis said.
There were four entrances in the room, according to Davis. He said that teams watched each door, prepared to defend themselves, and prayed.
"I said a really short prayer," Davis said. "To watch out for my wife and daughter, to watch out for anyone in the room, and to watch out for the people defending us."
Once everything was over, Davis and others learned about Clyde and what happened.
Davis said he watched videos of the gunfight on Twitter and realized how lucky he and others were.
"If he had gone through the door, there would have been some injuries, and fatalities to anyone standing there," Davis said.
He left the parking lot saying he was appreciative of the guards at the bottom of the building, who WFAA has learned are employed through a third-party contractor.
"Keeping him out of the building was a good thing...a great thing."