UPDATE 2: The FBI says the shooter in Dallas on Monday morning was Brian Isaack Clyde, 22. He was killed by officers who engaged in a shootout with him outside of the building.
UPDATE 1: The FBI has now reportedly taken over as the lead investigators of the shooting outside the federal building in Dallas.
DALLAS, Texas (TNN) - Downtown Dallas has been brought to a standstill after a gunman opened fire outside a federal building.
Police responded to the incident around 8:50 a.m.
The Dallas Police Department tweeted that gunfire had been exchanged between the suspect and federal officers. The suspect was shot in that exchange and is the only injury being reported.
Witnesses told a local reporters for CNN affiliate KTVT they believed the man was using an AK-47 assault rifle, had a mask on and was wearing some sort of camouflage.
The FBI, U.S. Marshals and the Bureau of Alcohol, Tobacco and Firearms responded to the scene, ABC affiliate WFAA reported.
We will continue to update the story as information becomes available.