Military experts have said one of the attackers appeared "tactically professional" and "focused" in videos taken of the ambush. The black man, a resident of the Dallas suburb of Mesquite, had no prior criminal record and was described to police as a "loner".
Johnson served as a private first class in the U.S. Army Reserve from March 2009 to April 2015.
It's unclear exactly what type of robot was used in the suspect's death.
Although Johnson said he wanted to kill white police officers because of recent police shootings of black men, Dallas has one of the more diverse police forces in the us and it has reportedly made steps to improve its relationship with the black community.
Before his death, the gunman told officers that he was upset about police-involved shootings. "But how we handle it can do a lot of things", Rawlings said.
"Negotiations broke down and we had an exchange of gunfire with the suspect", he said. Five officers were killed, and seven more were wounded. "The suspect is deceased, as a result of the detonating of the bomb". "He expressed anger for Black Lives Matters", Brown said.
In addition to police, two civilians, a man and a woman. were shot and injured, the mayor said.
In 2014, even Radley Balko, a prominent and outspoken critic of excessive police force, praised chief Brown for the reforms he made.
Brown said three other people were in custody but didn't provide any additional details.
An Army veteran killed by Dallas police after the sniper slayings of five officers amassed a personal arsenal at his suburban home, including bomb-making materials, bulletproof vests, rifles, ammunition and a journal of combat tactics, authorities said Friday.
Gratitude first. Citizens in Dallas, Nashville, Boston and other cities throughout the nation showed their support for police officers on Friday, July 8, one day after the tragic sniper attack on police officers in Dallas.
Police formally identified the slain suspect as Micah Johnson, 25. This is the deadliest incident for US law enforcement since September 11.
While the White House ruled out any link between the gunman and known "terrorist organizations", Johnson's Facebook page ties him to several radical black activist movements listed as hate groups by the Southern Poverty Law Center.
'Then they all stand around and smile while their picture is taken with a hung, burned and brutalised black person, ' he wrote.
The congregation, which was held in Thanksgiving Square, featured speaking appearances from Dallas Police Chief David Brown, Mayor Mike Rawlings, State Senator Royce West and faith leaders of multiple denominations, according to Fox 4 News.