A 22-year-old Army veteran who was wearing a mask and carrying a high-powered rifle and more than 150 rounds of ammunition was shot and killed by police yesterday morning (June 17th) after he opened fire inside a federal court in downtown Dallas.Brian Isaack Clyde began shooting after he went to an entrance of the Earle Cabell Federal Building around 8:40 a.m. and was confronted by three Federal Protective Service officers who were stationed at the building. No-one else was hurt in the gun battle. Police didn't comment on a possible motive, butThe Daily Beast reported that Clyde posted far-right memes on Facebook, including about Nazism and the Confederacy.