[Daily Mail, where America gets its news]- Brian Issack Clyde, 22, was fatally shot after exchanging gunfire with federal officers outside the Earle Cabell Federal Building in Dallas
- Police said no one else was injured in the 8.50am encounter on Monday
- Dallas Morning News photographer Tom Fox said he saw the shooter, wearing a black mask open fire, cracking the glass in the courthouse door
- Video shows Clyde in a black mask carrying a gun running from the sidewalk near the courthouse to a parking lot across the street
- Clyde reportedly served in the US military for less than two years before he was discharged, and came from a military family
- In recent weeks, Clyde's Facebook postings have grown increasingly dark and disturbing
- He posted pictures of weapons and ammunition, and in a dark post on June 9 he warned that a 'f**king storm was coming'
- FBI, ATF, FPS, U.S. Marshals and the Dallas Police Department are investigating
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