On Tuesday (Sept. 27), officers from a San Diego suburb shot and killed a black man, Alfred Olango, after his sister had dialed 911 requesting emergency assistance because her brother was "not acting like himself" reports Vice News.

A bystander streamed the aftermath in Facebook. In the video, the man's sister is distraught and asks, "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."

Police said in a statement that Olango, 30, was walking in traffic and "endangering himself and motorists" when they arrived at the scene outside a strip mall around 2 p.m. local time. Police said that Olango "refused multiple instructions" to "remove his concealed hand from in his pocket." They then said that an officer took out his gun 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 unarmed.

Witnesses on the scene have said that instead of deescalating the situation, as they were initially called to do, police quickly resorted to gunfire. One bystander who recorded the incident on their cellphone voluntarily turned over their device to police for their investigation, the police chief said.

About 30 protestors gathered at the scene Tuesday evening.

"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."

This shooting comes on the heels of the police killings of Keith Scott in Charlotte, North Carolina and Terence Crutcher in Tulsa, Oklahoma, both of which ignited protests across the country. Olango is the 801st person to be killed by the police in 2016, according to The Guardian's The Counted. Among those killed, 196 were black and 35 of those killings were of unarmed persons.

You can watch the aftermath of the shooting below.