Amir Rahim leads protesters gathered at the El Cajon Police Department headquarters in chants to protest the fatal shooting of an unarmed black man Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Earnie Grafton TPX IMAGES OF THE DAY - RTSPWG2

Protesters gather along Broadway Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYET

Protesters gather along Broadway Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYFC

Tears stream down the cheeks of the daughter of Alfred Olango while she is embraced by her mother after the loss of Alfred Olango, who was shot by El Cajon police Tuesday, as the family gathers at a news conference in San Diego, California, U.S. September 29, 2016. REUTERS/Patrick T. Fallon - RTSQ3X4

A man raises his fist in support during a protest over the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYES

Protesters gather at the El Cajon Police Department headquarters to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYF4

Protesters gather at the El Cajon Police Department headquarters to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYFB

Protesters gather along Broadway Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker/File Photo - RTSQ2YK

Protesters shout slogans after blocking the intersection of Broadway and Mollison near the site where an unarmed black man was fatally shot by police on Tuesday in El Cajon, California, U.S. September 28, 2016. REUTERS/Earnie Grafton - RTSPXIK

Protesters gather along Broadway Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYF5

Protesters gather along Mollison Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYFA

Pamela Benge, mother of Alfred Olango, speaks as the family of Alfred Olango, who was shot by El Cajon police Tuesday, gathers at a news conference in San Diego, California, U.S. September 29, 2016. REUTERS/Patrick T. Fallon - RTSQ3XV

Protesters confront San Diego Sheriff's deputies near the site where an unarmed black man was fatally shot by police on Tuesday in El Cajon, California, U.S. September 28, 2016. REUTERS/Earnie Grafton - RTSPXIM

Protesters gather along Broadway Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYF6

Protesters gather along Mollison Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker TPX IMAGES OF THE DAY - RTSPYFG

Protesters gather near the El Cajon Police Department headquarters to protest fatal shooting of an unarmed black man Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Dan Whitcomb - RTSPXUO

Protesters gather along Mollison Avenue to protest the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYF9

Protesters hold candles at a vigil during a protest over the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYFK

Protesters look at candles at a vigil during a protest over the fatal shooting of an unarmed black man on Tuesday by officers in El Cajon, California, U.S. September 28, 2016. REUTERS/Sandy Huffaker - RTSPYFH

Protester leaders try to defuse an encounter with a motorist and protesters near the site where an unarmed black man was fatally shot by police on Tuesday in El Cajon, California, U.S. September 28, 2016. REUTERS/Earnie Grafton - RTSPXIG