Dallas Police Chief David Brown on bombing attack suspect: 'I'd do it again'

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Remote-control Bomb Robots: Law Enforcement's New Technology

The Dallas police chief on Monday defended his decision to use a bomb-strapped robot to kill the gunman suspected of fatally shooting five officers, insisting he would "use any tool necessary to save our officers' lives."

"I'd do it again," David Brown said, adding that the move "wasn't an ethical dilemma for me."

SEE ALSO: Man who shot Dallas police wanted to kill more officers

He said he advised those operating the robot after a two-hour standoff with the gunman, Micah Xavier Johnson, not to "bring the building down."

"That was the extent of my guidance," Brown said. The plan was devised in about 15 minutes, he said.

"We knew this was the suspect. He was asking us how many did he get," Brown said. "And he was telling us how many more he wanted to get."

At that point, it was unknown how many officers Johnson had injured. Later, the chief learned that five were killed and others were wounded. He said Monday that nine officers were injured in the ambush.

Eleven officers fired at Johnson, including one of the wounded, Brown said Monday. Two operated the explosive device that left Johnson dead after negotiations with him failed.

See images from the scene:

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Officers killed at Dallas protest after police killings of two black men
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Officers killed at Dallas protest after police killings of two black men
Emergency responders administer CPR to an unknown patient on a stretcher as law enforcement officials stand nearby at the emergency receiving area of Baylor University Medical Center, early Friday, July 8, 2016, in Dallas. (AP Photo/Tony Gutierrez)
A Dallas police officer, who did not want to be identified, takes a moment as she guards an intersection in the early morning after a shooting in downtown Dallas, Friday, July 8, 2016. At least two snipers opened fire on police officers during protests in Dallas on Thursday night; some of the officers were killed, police said. (AP Photo/LM Otero)
A man raises his hands as he walks near a law enforcement officer, following the shootings Thursday of several police officers in downtown Dallas, early Friday, July 8, 2016. (AP Photo/LM Otero)
Police check a car early Friday, July 8, 2016, in Dallas, Snipers opened fire on police officers in Dallas on Thursday night; some of the officers were killed, police said. (AP Photo/LM Otero)
Dallas police check a car after detaining a driver in downtown Dallas, Thursday, July 7, 2016. Several police officers were shot by snipers, police said; some of the officers were killed. (AP Photo/LM Otero)
DALLAS, TX - JULY 7: Dallas police stand near the scene where four Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. According to reports, shots were fired during a protest being held in downtown Dallas in response to recent fatal shootings of two black men by police - Alton Sterling on July 5, 2016 in Baton Rouge, Louisiana and Philando Castile on July 6, 2016, in Falcon Heights, Minnesota. (Photo by Ron Jenkins/Getty Images)
Dallas police officers stand in a line near the site of shootings in downtown Dallas, early Friday, July 8, 2016. Snipers opened fire on police officers, police said; some of the officers were killed. (AP Photo/LM Otero)
Dallas police move to detain a driver after several police officers were shot in downtown Dallas, Thursday, July 7, 2016. At least two snipers opened fire on police officers during protests in Dallas on Thursday night; some of the officers were killed, police said. (AP Photo/LM Otero)
DALLAS, TX - JULY 7: Dallas police stand watch near the scene where four Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. According to reports, shots were fired during a protest being held in downtown Dallas in response to recent fatal shootings of two black men by police - Alton Sterling on July 5, 2016 in Baton Rouge, Louisiana and Philando Castile on July 6, 2016, in Falcon Heights, Minnesota. (Photo by Ron Jenkins/Getty Images)
Dallas police gather as a crowd forms in downtown Dallas, early Friday, July 8, 2016. Snipers opened fire on police officers in Dallas; some of the officers were killed, police said. (AP Photo/LM Otero)
DALLAS, TX - JULY 7: Dallas residents sit near the scene where four Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. According to reports, shots were fired during a protest being held in downtown Dallas in response to recent fatal shootings of two black men by police - Alton Sterling on July 5, 2016 in Baton Rouge, Louisiana and Philando Castile on July 6, 2016, in Falcon Heights, Minnesota. (Photo by Ron Jenkins/Getty Images)
An unidentified woman and a law enforcement officer hold hands as they walk out of the Baylor University Medical Center emergency reception area, early Friday, July 8, 2016, in Dallas. (AP Photo/Tony Gutierrez)
DALLAS, TX - JULY 7: Dallas police and residents stand near the scene where four Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. According to reports, shots were fired during a protest being held in downtown Dallas in response to recent fatal shootings of two black men by police - Alton Sterling on July 5, 2016 in Baton Rouge, Louisiana and Philando Castile on July 6, 2016, in Falcon Heights, Minnesota. (Photo by Ron Jenkins/Getty Images)
Dallas police order people away from the area after several police were shot in downtown Dallas, Thursday, July 7, 2016. (AP Photo/LM Otero)
The El Centro College parking garage stands in downtown Dallas early Friday, July 8, 2016. Snipers opened fire on police officers in Dallas, killing several during protests over two recent fatal police shootings of black men, police said. Police said three suspects were in custory and a fourth suspect was exchanging gunfire with authorities, Dallas Police Chief David Brown said early Friday morning. The suspect is not cooperating and has told negotiators he intends to hurt more law enforcement officials, the chief said. (AP Photo/LM Otero)
DALLAS, TX - JULY 7: Dallas residents stand near the scene where four Dallas police officers were shot and killed on July 7, 2016 in Dallas, Texas. According to reports, shots were fired during a protest being held in downtown Dallas in response to recent fatal shootings of two black men by police - Alton Sterling on July 5, 2016 in Baton Rouge, Louisiana and Philando Castile on July 6, 2016, in Falcon Heights, Minnesota. (Photo by Ron Jenkins/Getty Images)
Dallas police detain a driver after several police officers were shot in downtown Dallas, Thursday, July 7, 2016. Snipers apparently shot police officers during protests and some of the officers are dead, the city's police chief said in a statement. (AP Photo/LM Otero)
Dallas police stop a driver in downtown Dallas, Thursday, July 7, 2016, following shootings of police officers. Snipers apparently shot police officers during protests and some of the officers are dead, the city's police chief said in a statement. (AP Photo/LM Otero)
Dallas police move to detains a driver after several police officers were shot in downtown Dallas, Thursday, July 7, 2016. Snipers apparently shot police officers during protests and some of the officers are dead, the city's police chief said in a statement. (AP Photo/LM Otero)
Law enforcement officers stand outside the emergency room at Baylor University Medical Center, early Friday, July 8, 2016, in Dallas. At least two snipers opened fire on police officers in Dallas on Thursday night. (AP Photo/Tony Gutierrez)
Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A Police officer stands guard at a baracade following the sniper shooting in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
Protestors yell after police officers arrest a bystander following the shooting at a protest in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A Dallas policeman keeps watch on a street in downtown Dallas, Thursday, July 7, 2016, following reports that shots were fired during a protest over two recent fatal police shootings of black men. (AP Photo/LM Otero)
Protestors yell after police officers arrest a bystander following the shooting at a protest in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
Protestors yell after police officers arrest a bystander following the shooting at a protest in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A police officer tries to calm protestors following the sniper shooting in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A police officer tries to calm protestors following the sniper shooting in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
Police attempt to calm the crowd as someone is arrested following the sniper shooting in Dallas on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
Police cars sit on Main Street in Dallas following the sniper shooting during a protest on July 7, 2016. A fourth police officer was killed and two suspected snipers were in custody after a protest late Thursday against police brutality in Dallas, authorities said. One suspect had turned himself in and another who was in a shootout with SWAT officers was also in custody, the Dallas Police Department tweeted. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
Tonight it appears that two snipers shot ten police officers from elevated positions during the protest/rally.... https://t.co/JzHhoMzF5k
With heavy hearts, we are devastated to report a fourth officer has been killed.
2 snipers kill 3 police officers, wound 7 others in Dallas during protest. https://t.co/mm44qKgE40 (Photo: AP) https://t.co/DyaCmJRd2n
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A man holds a bat reading 'Black Power' during a protest in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A man lays on the ground after yelling 'Don't shoot me' at police during a rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
A woman takes pictures of the rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on Thursday, July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
People rally in Dallas, Texas, on July 7, 2016 to protest the deaths of Alton Sterling and Philando Castile. Black motorist Philando Castile, 32, a school cafeteria worker, was shot at close range by a Minnesota cop and seen bleeding to death in a graphic video shot by his girlfriend that went viral Thursday, the second fatal police shooting to rock America in as many days. / AFP / Laura Buckman (Photo credit should read LAURA BUCKMAN/AFP/Getty Images)
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Brown said Sunday that the investigation into the shooting has revealed that Johnson had enough explosives in his home and knowledge to render "devastating effects throughout our city and our north Texas area."

The investigation is now focused on cryptic letters Johnson wrote in his own blood — "RB" — in two areas of the building he had barricaded himself in after the shooting.

Related: Dallas Police Chief: Sniper Left Ominous Message Written in Blood, Planned Explosions

Detectives are also combing through 170 hours of body camera video from the scene of the shooting and reviewing statements from witnesses and officers to determine who should be questioned further to bring greater light to the attack, which Brown has said was a reaction to recent two police shootings of black men,Alton Sterling and Philando Castile.

Authorities have said that Johnson, an Army veteran, acted alone, but investigators are still working to make sure he didn't have help and no one else was aware of his plans.

"I'm highly protective of cops and I want to make sure there's nobody else out there that had something to do with this," Brown said.

Brown expressed repeatedly his dedication to his officers while speaking with reporters Monday. He said "my brain is fried" and "I'm running on fumes" in the wake of the carnage, but spoke clearly and passionately about his city and the men and women he oversees who work to keep it safe.

The department is hurting as officers deal with the investigation into the shooting, the policing responsibilities of the day-to-day and the upcoming services for those they lost.

Related: Dallas Shootings Took Heavy Toll on Officers of the Southwest Division

"It's going to be the most challenging thing in my life," Brown said. "I don't know how I'm going to do the rest of the week."

But "I'm a person of faith," Brown said. "I believe that I'm able to stand here is a testament to God's grace and his sweet tender mercies, just to be quite honest with you."

"This tragedy ... will not discourage us from changing and performing policing in America," Brown vowed.

Brown's resolve was lauded by the team at Parkland Trauma Center that treated seven of the injured officers Thursday night and expressed that even in their state of pain, they too, would not lose sight of their mission to care for the people of Dallas.

"I think the chief said it best this morning: We're hurting we're all hurting. This rocked some guys to their core who I thought were unshakable," said Parkland's Medical Director Dr. Alexander L. Eastman.

But "this city needs us to keep moving forward. This is a time for us to all come together," Eastman said.

He said Dallas would use the situation for good and "people who never before talked to one another, or hugged one another — black, white, surgeon, not — we don't care. ... This city is going to come together and show the world exactly what we're made of."

Dr. Brian H. Williams, a staff surgeon who was working at Parkland Thursday night, echoed Eastman's sentiment, saying the violence impacted him personally because, as a black man, "I understand the anger and the frustration and destruction of law enforcement."

"But I abhor what has been done to these officers," Williams said.

"Black men dying, people retaliating. We have to come together and end all this," he said. "This killing it has to stop."

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