Killer robot used by Dallas police appears to be a first

"We need to have the community support, and we know we're not going to be effective without it, " Salvatore said after the killings of five officers in Dallas.

Police initially said it seemed two shooters were involved, but US Homeland Security Secretary Jeh Johnson said Friday the gunman appeared to have acted alone.

A civilian was also shot, with no update on their condition.

Seiple says he wishes people wouldn't judge all police the actions of a few. "The suspect stated he wanted to kill white people, especially white officers".

This week's killings of two black men by police officers in Louisiana and Minnesota were the latest in a long string of similar, controversial killings that have led to nearly two years of national protests over race and justice.

Dallas Mayor Mike Rawlings said police believe that Johnson was the lone shooter, adding that he had "written manifestos on how to shoot, move, shoot, move".

Dallas PD says that they have discovered bomb making materials, rifles, ammunition, ballistic vests and a journal of combat tactics in Micah Johnson's home.

After negotiations between authorities and the gunman "broke down", however, police became convinced that Johnson was still an active threat and deployed a "bomb-disposal robot" that killed him. After the shooting, the Omni Hotel briefly displayed blue lines in its lighting display, representing the officers who were killed. It said he was a carpentry and masonry specialist. The U.S. Army confirmed that Mr. Johnson served between March, 2009, and April, 2015, including one tour in Afghanistan. New Hampshire police said the shootings are forcing them to ask tough questions while they mourn those who were lost.

Police described Thursday night's ambush as carefully planned and executed and said they had taken three people into custody.

Following the release of Johnson's name to the public on Friday, Johnson's sister reportedly posted about the shock of her brother's involvement on a Facebookpost.

Mr. Cooper says he played basketball with him dozens of times near Mr. Johnson's suburban Dallas house.

"None of that makes sense", Brown said.

In a separate tweet, he said the "hands up, don't shoot" rhetoric often used in "Black Lives Matter events" "is a lie" the media needs to dispel.

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