A US 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 say.

The man identified as 25-year-old Micah Johnson told authorities that he was upset about the police shootings of two black men earlier this week and wanted to exterminate whites, “especially white officers,” officials said.

He was killed by a robot-delivered bomb after the shootings. In all, 12 officers were shot.

Police say officers have also been targeted in Tennessee, Georgia and Missouri, with the attack in Tennessee occurring hours before the one in Dallas. Two officers were wounded, one critically.

Johnson was a private first class from the Dallas suburb of Mesquite with a specialty in carpentry and masonry. He served in the US army reserve for six years starting in 2009 and did one tour in Afghanistan from November 2013 to July 2014, the military said.

After the attack on Thursday, he tried to take refuge in a parking garage and exchanged gunfire with police, Police Chief David Brown said.

The suspect described his motive during negotiations and said he acted alone and was not affiliated with any groups, Brown said.

Dallas Mayor Mike Rawlings said on Friday authorities believe the suspect was the lone attacker and that the city is safe.

Rawlings said at a news conference that he believes the city can start healing now.

The shootings, the latest major gun violence to rock the United States, took place toward the end of a march protesting incidents earlier in the week in Louisiana and Minnesota in which police fatally shot black men in confrontations whose bloody aftermath was caught on video.

‘This was a well-planned, well-thought-out, evil tragedy by these suspects. And we won’t rest until we bring everyone involved to justice,’ Dallas Police Chief David Brown said on Friday.

‘We are determined to not let this person steal this democracy from us.’

During lengthy negotiations with police, the gunman said ‘the end is coming,’ Brown told reporters.

‘He said he was upset about the recent police shootings,’ said Brown, who is black.

‘The suspect said he was upset at white people. The suspect stated that he wanted to kill white people, especially white officers.’

In Poland for a NATO summit, President Barack Obama called the shooting ‘a vicious, calculated and despicable attack on law enforcement.’

Obama, who has been stymied by the Republican-led Congress in his bid for new gun control laws, added, ‘We also know when people are armed with powerful weapons unfortunately it makes attacks like these more deadly and more tragic.’

A string of killings of black men and boys by police in cities including Ferguson, Missouri, New York, Baltimore, Chicago, Cleveland, Tulsa, Oklahoma and North Charleston, South Carolina have given rise to the Black Lives Matter movement against excessive police force.

The killings have spurred almost two years of periodic and largely peaceful street protests.

A Twitter account describing itself as representing the Black Lives Matter movement sent the message: ‘Black Lives Matter advocates dignity, justice and freedom. Not murder.’

US Attorney General Loretta Lynch said the Justice Department would assist in the investigation into the shooting.

‘Do not let this week precipitate a new normal in this country,’ Lynch told reporters in Washington.

With Reuters

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A US 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 say. The man identified as 25-year-old Micah Johnson told authorities that he was...