After the death of lone Dallas sniper, Micah Xavier Johnson, following a stand-off with police yesterday, authorities have discovered bomb-making material, rifles and a combat journal at his home.

The US ex-soldier, who shot dead five officers from an elevated position during a ‘Black Lives Matter’ protest just before 9pm on Thursday (local time), was killed by a bomb-carrying robot after hours of unsuccessful negotiations.

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Images have emerged of slain Dallas sniper suspect, Texas resident Micah Xavier Johnson, 25. (Facebook)

Police have described 25-year-old Johnson as a “loner” who was out to “kill white officers”.

"During the search of the suspect's home, detectives found bomb-making materials, ballistic vests, rifles, ammunition, and a personal journal of combat tactics," the Dallas Police Department said in a statement.

“The suspect said he was upset at white people. He was upset at the Black Lives Matter protest,” Dallas Police Chief David Brown said.

Initial investigations suggested there was more than one gunman, however Dallas mayor Mike Rawlings and US Homeland security secretary Jeh Johnson have since said they believed Johnson had acted alone.

Mr Rawling said Johnson had written a manifesto, which detectives found at his home.

The US Army said Johnson had served as a private first class in the Army Reserve, made up of part-time soldiers, and was deployed to Afghanistan from November 2013 to July 2014. It said Johnson served as an active reservist from 2009 to 2015 and was a carpentry and masonry specialist.

Thousands of peaceful protesters took to the streets in US cities in the wake of the Dallas shooting, again organised by the Black Lives Matter organisation. Crowds marched in Atlanta, Georgia, Houston, New York, Texas and San Francisco after the tragedy, and many protested outside the White House.

US police have also been issued new orders, in New York, Washington, Boston and Chicago no officer is allowed to patrol alone.



Before his death, Johnson had exchanged gunfire with police while holed up in a garage at El Centro College in downtown Dallas. He claimed he had planted bombs ‘all over the city’, however Dallas polices’ Major Max Geron confirmed police found no explosives.



Police said Johnson mentioned during negotiations he was upset about police shootings of black men and wanted to kill white people, specifically white officers.

During the negotiations, he said "the end is coming", Dallas Police Chief David Brown said.

"He said he was upset about the recent police shootings, " he said.

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

"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.

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

A total of three other people had been taken into custody after the shootings, including a woman who was arrested near the garage and two people travelling in a black Mercedes.



Video from a Fox News crew captured the sound of gunshots at the protest, followed by screams from the crowds, who just moments earlier had been chanting, "don't shoot".

Video has also emerged of the gunman firing from behind a pillar.

The gunman can be seen taking shots, before sneaking up behind a police officer and again opening fire.

Two civilians were injured in the shooting.

Shetamia Taylor, 37, was struck while reportedly shielding her young sons.

Her sister, Theresa Williams, told local media she was undergoing surgery after being shot in the calf.

US President Barack Obama condemned the attack as "a vicious, calculated and despicable attack on law enforcement".

"There is no possible justification for these kinds of attacks or any violence against law enforcement," Mr Obama said.

"Anyone involved in the senseless murders will be held fully accountable. Justice will be done."

Dallas Mayor Mike Rawlings echoed his sentiment.

"We must step up our game and approach complicated issues in a different way," Mr Rawlings said.

"And race is complicated."

He urged Americans to “step up” to address the country’s racial divide.

One of the five officers killed has been identified as Dallas Area Rapid Transit [DART] officer Brent Thompson, 43.

"DART is grieving the loss of Officer Brent Thompson and is the first DART officer killed in the line of duty," police tweeted.

Other victims include 32-year-old Navy veteran and police officer Patrick Zamarripa, 40-year-old officer Michael Krol, 55-year-old Sergeant Michael Smith and 48-year-old Senior Corporal Lorne Ahrens.

Seven other officers were wounded.

Dallas police thanked people for their support in a statement.

"We are so thankful for the overwhelming prayers, support, love, and donations from everyone. Please continue to keep the families of the officers in your thoughts and prayers," it read.

A Dallas Area Rapid Transit (DART) Police supporter watches the emergency entrance to Baylor University Hospital as a police officer's body is taken from the facility in Dallas, Texas, USA, 08 July 2016; a DART police officer receives comfort at the emergency room entrance. (AFP)

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The Black Lives Matter movement originated after 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.

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".

The shooting is the deadliest attack on US law enforcement since September 11, 2001.

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