Johnson told reporters that he ordered the footage released to address any misinformation about the shooting and maintain calm in a bid to avoid a repeat of Saturday's unrest.
Local residents had asked for more police presence in the area where the shooting took place but as news of Augustus' death spread, protesters took to the streets on Saturday night. Johnson said he chose to release the video on Sunday because "the community needs answers and they need them now".
"Last night was a very hard situation for everyone involved".
He said Augustus' family was in favor of releasing the video for the same reason. He says some squad cars were damaged. Three officers try to grab his arms and he tries to get away, backing into a police cruiser as his shirt flies up and shows the gun. Police say four people were arrested and some officers suffered minor injuries from being pelted with rocks and bottles, including some filled with urine.
Chicago police identify man killed after confrontation with officers, prompting heated protests
They said the driver of the vehicle that had been weaving in traffic was the woman who attempted to run away and was hit by another vehicle, police said. He spins and darts between the SUV and the police cruiser as he reaches toward his waist.
"They thought he appeared to be reaching for a weapon, which he did have a weapon on him, and the officers tragically shot him", he told AP. Guglielmi says he was in his 30s, wasn't a known gang member and didn't have a recent arrest history.
Guglielmi said the crowd was incited by false reports, including that the man was unarmed or had a concealed carry permit. The city erupted in protest in 2015 after the release of a video showing a white police officer shoot a black 17-year-old, Laquan McDonald 16 times a year earlier.
In a statement, the civil rights campaigner Rev Jesse Jackson called the shooting a tragedy and said it was a blessing Augustus did not bring his daughter with him to work on Saturday, as he was known to do. Chicago Police Chief Fred Waller said a group of officers patrolling the city's South Shore neighborhood at about 5:30 p.m. saw a person they believed to be armed and confronted him. McDonald's death led to the ouster of the police chief and a series of reforms created to prevent future police abuses and to hold officers accountable for excesses.
Chicago residents have taken to the streets to protest police-involved shootings before. Chicago ABC station WLS captured video of protesters pushing and shoving back and forth with police officers.