Dallas Gunman Identified as Micah Xavier Johnson, Who Had No Record: Report

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The gunman who killed five police officers and wounded seven others Thursday night before being killed in a standoff with cops in Dallas has been identified as Micah Xavier Johnson, according to news reports. 

Johnson, 25, was killed in a parking garage at El Centro College after opening fire as demonstrators with the Black Lives Matter movement protested police's treatment of blacks in America, according to reports.

The Mesquite, Texas, native reportedly had no criminal record or no known ties to terrorism. He claimed to be a U.S. Army veteran, law enforcement told CBS News

After police cornered him, they tried to negotiate with for several hours before making the decision to send in a robot carrying a bomb they detonated near him, Dallas Police Chief David Brown said at a press conference Friday.

Read: Suspect in Dallas Shooting That Left 5 Officers Dead 'Wanted to Kill White People, Especially White Cops'

“Other options would’ve exposed our officers to grave danger,” Brown said. 

A hostage negotiator spoke with the suspect at length before negotiations broke down, Brown said.

“The suspect said he was upset about [the] Black Lives Matter [movement]. He said he was upset about the recent police shootings. The suspect said he was upset at white people… wanted to kill white people, especially white officers,” Brown said.

Read: Hero Mom Wounded While Shielding Her Sons From Gunfire During Dallas Sniper Attack

The man told police he was not affiliated with any groups and that he acted alone, warning officers that they would “eventually find the IEDs,” or improvised explosive devices, Brown continued.

Police found no explosives during primary or secondary searches of the area, authorities said.

Police have three other suspects in custody. One is a woman, law enforcement sources told NPR

A commander in the Dallas Police Department described the shooting as a "conspiracy," saying several people were involved in the planning, logistics and execution of the coordinated attack, the Dallas Morning News reported.

Watch: Newlywed Transit Officer and Military Veteran Among 5 Dallas Sniper Victims