San Diego police shot and killed an unarmed black man

Officers from a San Diego suburb shot and killed a black man on Tuesday, after his sister had dialed 911 requesting emergency assistance because her brother was "not acting like himself."

A bystander livestreamed the aftermath of the shooting on Facebook. In the video, a woman, reportedly the victim's sister, is distraught. "Why couldn't you tase him? I told you he is sick. And you guys shot him. I called police to help him, not to kill him." The video has been viewed over 51,000 times.

El Cajon police wrote in a statement that Alfred Olango, 30, was "walking in traffic, not only endangering himself, but motorists" when they arrived at the scene outside a strip mall at around 2 p.m. local time.

Police said that Olango "refused multiple instructions" to "remove his concealed hand from in his pocket." Because the subject did not comply, the officer drew his firearm and pointed it" at Olango.

"At one point, the subject rapidly drew an object from his front pants pocket, placed both hands together and extended them rapidly toward the officer, taking up what appeared to be a shooting stance," police wrote.

One officer discharged their Taser, while simultaneously the other officer pulled the trigger on his gun "several times."

Police have since acknowledged that Olango was not armed – the object he was "pointing" at the officers was not a weapon.

Witnesses at the scene told local news station CBS 8 that the police, rather than trying to deescalate the situation, hastily resorted to gunfire. Police Chief said that one bystander who recorded the incident on their cellphone voluntarily turned over their device to police for their investigation.

A crowd of about 30 protesters gathered at the site of the shooting on Tuesday evening – some angry over what they described as a racially motivated shooting, while others led peaceful prayer circles, according to CBS 8.

"The El Cajon Police would like to assure the community that a complete and thorough investigation will be completed" the department said in a statement. "We have already contacted the District Attorney's Office so that they can conduct their concurrent investigation and their representatives are already on scene."

The incident comes on the heels of two recent police shootings of black men – Terrence Crutcher in Tulsa, Oklahoma, and Keith Lamont Scott in Charlotte, North Carolina. Video footage of those shootings sparked protests and angry riots in Charlotte, and led to the arrest of Tulsa officer Betty Shelby.

According to The Guardian's "The Counted", which tracks police killings, Olango was the 801st person to be killed by law enforcement in 2016.