Hours later and several miles from the Saturday afternoon shooting, there was a second deadly Anaheim police shooting.
Late Sunday, anti-gang officers spotted a gang member in a stolen sport utility vehicle, and a brief pursuit ended when three people jumped from the SUV and ran, authorities said.
Sgt. Bob Dunn said officers were chasing the suspects on foot when one of them fired one or two rounds at an officer. The officer retuned fire, killing the gunman.
Earlier Sunday, protesters chanted "no justice, no peace" and "cops, pigs, murderers" as officers stood by and watched a demonstration over the Saturday officer-involved shooting.
Police Chief John Welter said two officers were placed on paid leave after one of them fatally shot Manuel Diaz, 24, Saturday afternoon.
He said the officers approached three men who were acting suspiciously in an alleyway when they ran away. One of the officers chased Diaz to the front of an apartment complex where the shooting occurred.
Welter would not say what led the officer to shoot Diaz, citing an independent investigation by the county's district attorney office. Police said Diaz was a known gang member.
The shooting sparked a melee in the neighborhood as some threw rocks and bottles at officers who were securing the scene for investigators to collect evidence. Sgt. Bob Dunn, the department's spokesman, said that as officers detained an instigator, the crowd advanced on officers so they fired bean bags and pepper balls at them.
Video captured by a KCAL-TV crew showed a chaotic scene as some people ducked to the ground and others scattered screaming. A man is seen yelling at an officer even as a weapon is pointed at him; two adults huddled to shield a boy and girl. Meanwhile, a police dog charged at several people sitting on the grass, including a woman and a child in a stroller, before biting a man in the arm.
Dunn said the dog accidentally got out of a patrol car. He said he didn't know whether police warned the crowd to disperse before firing the rubber bullets and pepper balls.
Throughout the night, police in multiple marked and unmarked squad cars attempted to control an unruly crowd gathered near the shooting scene, where some moved a Dumpster into an intersection and set its trash on fire.
Dunn said five people, two of them juveniles, were arrested during the unrest.