DALLAS (AP) — The Latest on the shooting of police officers in Dallas (all times local):

Joe Walsch

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11:45 a.m.

A former Illinois congressman is standing by a Twitter post he sent after the fatal shooting of police officers in Dallas in which he warned President Barack Obama to “Watch out.”

Joe Walsh told The Associated Press on Friday that he didn’t intend to incite violence against Obama or anyone else. He says “that’s just stupid” and “would be wrong and reprehensible.”

The one-term Republican congressman and radio host from suburban Chicago posted the tweet after five police officers were killed and seven wounded during a protest of fatal shootings by police in Louisiana and Minnesota.

His tweet read: “This is now war. Watch out Obama. Watch out Black lives matter punks. Real America is coming after you.”

The post has been deleted.

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11:40 a.m.

The Bureau of Alcohol, Tobacco, Firearms and Explosives is assisting in the investigation into a shooting in downtown Dallas that left five police officers dead.

The agency said Friday that it won’t immediately release information about the type of weapons used in the attack during a demonstration Thursday to protest the killing of black men in Louisiana and Minnesota by white police officers.

Officers at the scene of the shooting say some kind of rifle was used.

Weapons such as the AR-15 semi-automatic rifle are easy to fire and generally accurate. Little or no training is required to fire such weapons and they are widely available.

Seven officers and two civilians were also wounded in the attack.

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11:30 a.m.

Attorney General Loretta Lynch is calling for peace and calm in the wake of the attack on police officers in Dallas, saying that violence is never the answer.

Lynch said Friday at the Justice Department in Washington that it has been a week of heartbreak and loss for the nation.

Five police officers were killed by gunfire in Dallas Thursday night at a peaceful protest march prompted by the shootings by police of Black men in Louisiana and Minnesota.

Lynch says the spate of violence can’t be allowed to “precipitate a new normal.” Calling the Dallas attack “an unfathomable tragedy,” she says those concerned about suspect killings by police should not be discouraged “by those who use your lawful actions as a cover for their heinous violence.”

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11:15 a.m.

Investigators can be seen walking in and out of a suburban Dallas house believed to be that of a man suspected in the overnight attack that killed five Dallas police officers and wounded seven others.

About a half-dozen police vehicles are parked outside the two-story brick home in Mesquite thought to be that of Micah Johnson.

Authorities haven’t publicly disclosed the name of a suspect whom police killed with a robot-delivered bomb after negotiations failed. But a law enforcement official speaking on the condition of anonymity because he wasn’t authorized to release the information told The Associated Press that he was 25-year-old Micah Johnson.

Mesquite authorities say they were at the home to assist Dallas investigators.

Associated Press writer Will Weissert contributed to this report.

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NAACP President Cornell William Brooks

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10:50 a.m.

The president of the NAACP is calling for policies, not handwringing, in the wake of the deadly attack on police in Dallas.

Cornell William Brooks made the comment in an interview Friday on “CBS This Morning.” He says that includes establishing a national standard for excessive use of force and federal laws that address police accountability and community trust.

The attack began Thursday night at a protest over recent killings by police of Black men in Louisiana and Minnesota. Five officers were killed and seven others were wounded. Two civilians were also wounded and police killed a suspect.

Brooks says citizens are afraid and capturing more fatal shootings by police on video due to a minority of officers “who defile the profession by their conduct.”

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Dallas Police Chief David Brown

10:20 a.m.

A robotics expert says Dallas police appear to be the first law enforcement agency to use a robot to kill.

Peter W. Singer, of the New America Foundation, says the killing of a suspect in Thursday night’s fatal shooting of five police officers is the first instance of which he’s aware of a robot being used lethally by police.

Dallas Police Chief David Brown told reporters that after hours of failed negotiations and in order to not put any officers in harm’s way, his department used a robot to deliver a bomb that killed the suspect. Brown said they saw no other option.

Singer said in an email Friday that when he was researching his 2009 book “Wired for War” a U.S. soldier told him troops in Iraq sometimes used MARCbot surveillance robots against insurgents.

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10:10 a.m.

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Slain suspect Micah Johnson

A Texas law enforcement official has told The Associated Press that a slain suspect in the attack on Dallas police was 25-year-old Micah Johnson.

The official spoke on the condition of anonymity because he said he was not authorized to release the information. There were no immediate details on the suspect’s middle name or hometown.

The attack began Thursday night during a protest about the recent killings by police of Black men in Louisiana and Minnesota. Five officers were killed and seven others were wounded. Two civilians were also wounded.

Police Chief David Brown said Friday that his department used a robot-delivered bomb to kill a suspect after hours of negotiations failed. He says the suspect expressed anger over recent killings by police of Black men in Louisiana and Minnesota.

Associated Press writer Will Weissert contributed to this report.

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House Speaker Paul Ryan

9:40 a.m.

House Speaker Paul Ryan says anger over the police shootings in Dallas must not be allowed to harden the nation’s divisions.

Speaking Friday on the House Floor, Ryan said that “justice will be done.”

He says it’s been a “long month for America” and that the nation has seen terrible and senseless things.

But he says that in debating how to respond, “let’s not lose sight of the values that unite us, our common humanity.”

Ryan says: “A few perpetrators of evil do not represent us; they do not control us.”

House Minority Leader Nancy Pelosi took the floor after Ryan, joining in his expression of grief and thanking Dallas police officers for their service.

Pelosi says: “Justice will be done, justice must be done. Also mercy must be done.”

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9:10 a.m.

Dallas’ police chief says a suspect in the deadly overnight attack on police officers told negotiators that he acted alone and was unaffiliated with any group.

Chief David Brown said at a news conference Friday that the suspect also said he was upset about recent police shootings and wanted to kill White people, particularly White officers.

He says officers killed the suspect with a robot-delivered bomb after hours of negotiations failed.

Although Brown says the suspect said he acted alone, it remains unclear if that was the case. He said earlier Friday that three other suspects were in custody, but he later declined to discuss those detentions and said police still didn’t know if investigators had accounted for all participants in the attack.

The attack began Thursday night during a protest about the recent killings by police of Black men in Louisiana and Minnesota. Five officers were killed and seven others were wounded. Two civilians were also wounded.