Dallas suspect taunted police during 2 hours of negotiation

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Emotions are still running high after the Dallas attack on officers. (Facebook)

The suspect in the deadly attack on Dallas police taunted authorities during two hours of negotiations, laughing at them, singing and at one point asking how many officers he had shot, the police chief said Sunday.

The chief and the county's most senior elected official also said Micah Johnson had larger attack plans and possessed enough explosive material to inflict far greater harm.

"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 told CNN's "State of the Union."

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Johnson, a black Army veteran, insisted on speaking with a black negotiator and wrote in blood on the wall of a parking garage where police cornered and later killed him, Brown said.

The gunman wrote the letters "RB" and other markings, but the meaning was unclear. Investigators are trying to decipher the writing by looking through evidence from Johnson's suburban Dallas home, Brown said.

The writing suggested that Johnson was wounded in a shootout with police. An autopsy will confirm exactly how many times he was hit, Dallas County Judge Clay Jenkins said.

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Authorities do not "have any independent report from an officer saying, 'I think I hit him,'" Jenkins said.

The police chief defended the decision to kill Johnson with a bomb delivered by remote-controlled robot, saying negotiations went nowhere and that officers could not approach him without putting themselves in danger.

Brown said he became increasingly concerned that "at a split second, he would charge us and take out many more before we would kill him."
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The shootings marked the deadliest day for U.S. law enforcement since the Sept. 11, 2001, terrorist attacks. In all, 12 officers were shot just a few blocks from where President John F. Kennedy was slain in 1963.

So far, the evidence points to the attack being a "crime of opportunity," Jenkins said.

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Investigators believe Johnson had been practicing and training for a long time and probably learned of the protest from social media and concluded there would be many police present.

Authorities have said the 25-year-old gunman kept a journal of combat tactics and had amassed a personal arsenal at his home that included bomb-making materials.

The fact that Johnson had material for explosives and talked of using homemade bombs during the standoff with police indicated he could have inflicted more damage with more time, Jenkins said.

"If this had not been a crime of opportunity where the protest was quickly organized in response to events in the same week ... he could have caused a lot more harm than he did," he said.

Federal agents are trying to trace the origin of the weapons used in the attack, including a military-style semi-automatic rifle.

About 30 agents are also involved in identifying bullet casings, said William Temple, the Dallas agent in charge for the Bureau of Alcohol, Tobacco, Firearms and Explosives.

The large crime scene includes the parking garage where Johnson was killed and at least two other sites where he is believed to have fired at officers.

Johnson was a private first class with a specialty in carpentry and masonry. He served in the Army Reserve for six years starting in 2009 and did one tour in Afghanistan from November 2013 to July 2014, the military said.

The attack began Thursday evening while hundreds of people were gathered to protest the police killings of Philando Castile, who was fatally shot near St. Paul, Minnesota, and Alton Sterling, who was shot in Louisiana after being pinned to the pavement by two white officers.

Video showed protesters marching along a downtown street about half a mile from City Hall when shots erupted and the crowd scattered, seeking cover.

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Investigators are looking through evidence from Johnson's suburban Dallas home to try to figure out what those letters might mean, Brown said.

The chief defended the decision to kill Johnson using a robot-delivered bomb, saying negotiations went nowhere and that officers could not approach him without putting themselves in danger.

During the roughly two-hour standoff in the garage, Johnson lied to and taunted the police negotiators, Brown said.

Johnson had practiced military-style drills in his yard and trained at a private self-defense school that teaches special tactics, including "shooting on the move," a maneuver in which an attacker fires and changes position before firing again.
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