Dallas Police Chief told CNN’s Jake Tapper that Micah Xavier Johnson definitely had other plans after finding a journal that’s still being reviewed, bomb-making materials. He said that Johnson felt killing police officers was the right thing to do, and that they’re still investigating what he meant by writing “RB” on the wall in blood, let alone why he did it (via CNN):
We're convinced that this suspect had other plans and thought that what he was doing was righteous and believed that he was going to target law enforcement -- make us pay for what he sees as law enforcement's efforts to punish people of color," Brown said in an interview with CNN's Jake Tapper on "State of the Union."
Brown said police found bomb-making materials and a journal at the shooter's home that suggested he'd been practicing detonations and appeared ready to take aim at larger targets.
He said the shooter, Micah Johnson, "obviously had some delusion. There was quite a bit of rambling in the journal that's hard to decipher."
Among Dallas investigators' current goals: Figure out what Johnson had meant by "RB," lettering that Brown said he'd written on the wall in blood before his death.
Police are "trying to figure out what those initials mean, but we haven't determined that yet," Brown said.
"At the scene where he was killed, he wrote some lettering in blood on the walls, which leads us to believe he was wounded on the way up the stairwell, on the second floor of the El Centro building and where we detonated the device to end the standoff there was more lettering written in his own blood," he said.
On July 7, Johnson opened fire on Dallas police officers at the conclusion of a Black Lives Matter rally, shooing twelve and killing five in the worst attack law enforcement has seen since 9/11. He said he was angry with white people; he wanted to kill them—especially white members of the police force. He had held up at the El Centro College parking complex. The standoff ended when police killed him using a bomb attached to a robot in the early morning hours the following day.