Police in California shot dead a mentally unstable Ugandan refugee after he pulled an object from his pocket, pointed it and assumed a "shooting stance".
Dozens of demonstrators have now taken to the streets of El Cajon, a suburb of San Diego where he was killed, to protest at the killing of Alfred Okwera Olango, 38.
Mr Olango, was killed on Tuesday after officers responded to a call from his sister who said that he was mentally ill and needed help.
Police said the shooting happened outside a row of shops as they responded to a report of a mentally unstable person walking in and out of traffic.
Upon arrival of the officers, pulled a vape smoking device from his pocket and pointed it at police before one officer fired an electronic stun gun and another officer simultaneously fired his firearm several times.
Police however gave no details about the object he was holding but El Cajon police chief Jeff Davis acknowledged that it was not a weapon.
Christopher Rice-Wilson of the civil rights group Alliance San Diego questioned why one of the officers felt non-lethal force was appropriate while the other did not.
His death has set off demonstrations in the San Diego suburb with activists demanding that authorities release video of the shooting and a federal probe is launched into Olango's death.
The victim's sister, shrieked and cried, telling officers that she had called them to help her brother.
"I just called for help and you came and killed him,'' she said.
You guys killed my brother in front of me," she cried. "Why couldn't you guys Tase him? Why? Why? Why? Why?"