Dallas Mourns as we Learn More About Police Ambush

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DALLAS -- As the days following the deadly Dallas ambush continue, investigators are beginning to learn more about the motivations of the killer, 25-year-old Micah Johnson.

Not only were there things like bomb-making materials, ballistic vests, rifles, ammunition found in the Mesquite house he lived in, but there are now reports that he was spotted by some neighbors doing military-type training exercises in the days leading up to the shooting.

Texas Attorney General Ken Paxton says part of the investigation moving forward includes making sure others weren't involved.

"One of the things they're trying to accomplish is to just make sure that there's no other conspiracies involved in this no other people involved in this transaction. So, I think you're going to see Dallas work through this, it's going to take some time, but I don't think it's going to be resolved overnight," said Paxton.

Back at the crime scene in Dallas, police still have a huge portion of the Downtown area blocked off.

That area - north to south - is between Ross Avenue and Jackson - and east to west - between Houston and Griffin.

Meanwhile - the memorial in front of DPD headquarters continues to grow, as do others in the area.

"We've seen an overwhelming show of support and love from our residents and from our business community," said the Deputy Police Chief of the DPD, Malik Aziz.

And while the investigation continues, so too does the mourning as Dallas, and the nation tries to start to move on.

"We're all human here, and I think that people feel each other's pain. And that's what makes it great, that's what makes you hopeful," said Dallas Mayor Mike Rawlings.