Earle Cabell Federal Building, 1100 Commerce St. in Dallas. Photo: Google.

The FBI is asking people to steer clear of a crime scene involving an active shooter at Dallas' Earle Cabell Federal Building.

FBI spokeswoman Janella Newsome wrote in an email that at 8:40 a.m., a shooter identified as Brian Isaack Clyde, 22, fired multiple shots at people inside the federal building located at 1100 Commerce St. in Dallas. Officers with the Federal Protective Service returned fire and wounded the shooter, who was taken to Baylor Hospital and pronounced dead. The FBI is calling for anyone with information about the shooting to call 1-800-Call-FBI or submit tips or photos at tips.fbi.gov.

The Dallas Police Department was tweeting about the shooting Monday morning and wrote that no officers or other citizens were injured. The department's bomb squad examined the suspect's vehicle as a precaution and decided to “do a controlled explosion of the suspect's vehicle,” according to a tweet.

According to the Associated Press, there was a Dallas Morning News photographer, Tom Fox, at the scene of the shooting who saw a masked man run and start shooting at the courthouse, cracking a glass door. Fox photographed officers tending to a shirtless man lying on the ground in a parking lot.

NBC 5 published a video, presumably of the shootout.

Chief Judge Barbara Lynn of the U.S. District Court for the Northern District of Texas said that she wasn't in the federal courthouse at the time of the shooting. Only one judge was inside at the time, and none of the other judges were allowed in the building, she said.

U.S. District Judge Barbara Lynn

“I was blocked and could never get in,” said Lynn. “My staff is in there but I can't get in there. I'm trying to get two staff out of the federal building for a hearing that I'm going to hold at my house.”

Six other federal judges besides Lynn practice at the Dallas courthouse, including U.S. District Judges Sam Lindsay, David Godbey, Ed Kinkeade, Jane Boyle and Karen Gren Scholer. The courthouse is also the work home of Senior Judges Joe Fish and Sidney Fitzwater. The U.S. Attorney's Office for the Northern District of Texas keeps its offices in the building.

“The area remains an active crime scene, and the building is locked down,” wrote U.S. Attorney's office spokeswoman Erin Dooley in an email.

Christopher Kratovil, managing member of Dykema's Dallas office, wrote in a message that his firm's office is less than a mile from the courthouse. It took him 45 minutes to drive the very last mile of his commute because of the massive law enforcement response to the shooting. None of his colleagues were at the courthouse this morning, but to be safe, the firm sent an email to everyone warning them to avoid the area.

“This shooting was just a few hundred yards, if that, from the location of the awful July 7, 2016 attack on the Dallas Police and the murder of 5 DPD officers. This morning brought back some terrible memories for me and everyone else who was downtown on July 7, 2016,” said Kratovil.

Dallas Bar Association President Laura Benitez Geisler wrote in a statement that the Dallas bar sincerely appreciates the first responders for protecting the lives and safety of people around the courthouse.

“In the past we have offered active shooter training for lawyers and judges with another program scheduled in September at the Frank Crowley Criminal Courthouse. While we don't yet know the shooter's motive for targeting the federal courthouse today, it is a sobering reminder that judges are frequently targets of attack solely for executing their duties to administer justice and protect the rule of law. The Dallas Bar stands behind our judiciary and all that they do to in furtherance of justice for all,” said Geisler.