Protesters gather along Mollison Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California. (Photo by Reuters)
Protests have erupted in the US state of California following the fatal shooting of another unarmed black man by police as tensions grow over police violence across the country.
Demonstrators gathered in El Cajon on Wednesday to condemn the police shooting of 38-year-old Alfred Olango who was reportedly mentally ill.
The Ugandan-born man was killed by officers on Tuesday after police received a report about a man acting erratically and walking in traffic.  
The rally continued into the night with hundreds of people marching from the shooting scene to El Cajon City Hall and back again, shouting Olango's name, insulting police and disrupting traffic.
Civil rights activists and several hundred protesters gathered outside the police department during the day, chanting "murder," "justice for Alfred Olango" and "black lives matter."
The protesters demanded the US Justice Department to investigate the fatal police shooting.
"We are not going to stop until we get justice," the Reverend Shane Harris, president of the National Action Network's San Diego chapter, said at the demonstration. "We do not trust local prosecutors to investigate local police."
A video taken moments after the shooting and posted on social media shows Olango‘s sister crying in anguish, "Oh my God. You killed my brother. I just called for help and ... you killed him."
The police killing came days after two African American men were killed by police in Charlotte, North Carolina, and Tulsa, Oklahoma, sparking protests against US police brutality.
A state of emergency and curfew were imposed by authorities to quell unrest in Charlotte.
Speaking to reporters on Wednesday, El Cajon Police Chief Jeff Davis appealed for calm. “I implore the community to be patient with us, work with us, look at the facts at hand before making any judgment," he said.