Five law enforcement officials were killed in the assault. Seven other officers and two civilians were wounded.
The attack marks the deadliest attack on law enforcement since Sept. 11, 2001, according to the National Law Enforcement Officers Memorial Fund.
Here’s what we know:
Who was Micah Xavier Johnson?
Johnson, 25, is believed to be the lone gunman in the attack, a law enforcement official told USA TODAY on Friday. He joined the Army Reserve in 2009 and served in Afghanistan for about eight months until July 2014, according to the U.S. Army. He left the Army in April 2015.
Johnson’s Facebook account also identified him as Fahed Hassen and as Richard GRIFFIN or Professor Griff, who embraces a “radical form of Afrocentrism,” the Dallas Police Department said in a statement. Johnson, as GRIFFIN, authored a book titled A Warrior’s Tapestry, police said.
Johnson was killed by a police-controlled remote explosive device about 45 minutes after authorities began trying to negotiate with him, police said. He was wearing heavy body armor and carrying multiple rounds of ammunition during the attack.
Police swarmed Johnson’s home Friday and recovered bomb-making material, ballistic vests, rifles and ammunition, police said.
A rifle and handgun were recovered from the scene where Johnson died, the official said. Johnson does not have a criminal record nor any apparent connections to criminal groups, the official added.
The official, who was not authorized to comment publicly, spoke on condition of anonymity.
Are there other suspects in the attack?
At least three other people were detained by authorities as possible suspects, but the law enforcement official told USA TODAY they may have no connection with the attack and the dead gunman. None of those detained have been identified.
The new account differs from previous descriptions offered immediately after the assault in which Dallas authorities attributed the shootings to at least two gunman.
Mark Hughes, a man whose photo was circulated after Dallas police initially called him a suspect, has been cleared as a person of interest.
What was the motive?
Johnson, who lived in Dallas, told officers he wanted to kill white police officers, and said he was not affiliated with any groups, Dallas Police Chief David Brown told reporters Friday morning.
“The suspect said he was upset about Black Lives Matter, he said he was upset about the recent police shootings,” Brown said. “The suspect said he was upset at white people. The suspect stated he wanted to kill white people, especially white officers.”
Brown said the police force and community were “heartbroken” following the incidents.
“There are no words to describe the atrocity that occurred to our city,” he said. “All I know is this must stop. This divisiveness between our police and our citizens.”