MSM coverage here and here. From the LA Times article:

Anaheim Police Sgt. Bob Dunn told The Times the incident began Saturday when two patrol officers tried to approach three men in an alley in the 600 block of North Anna Drive about 4 p.m.

It was unclear why the officers first approached the men, but Dunn said they gave chase and one of the officers followed one of the men to the front of an apartment complex in the 700 block of North Anna, where the shooting occurred about 4 p.m.

The man was taken to a hospital, where he died about 7 p.m., authorities said.

Police remained at the scene to investigate the shooting, Dunn said, and were encircled by a group of people who began throwing things, including bottles and possibly rocks, at the officers. At one point, the crowd also pushed a dumpster holding burning trash toward police, reports said.

Officers used non-lethal rounds and pepper balls to control the crowd, Dunn said. A police dog also got free from an officer’s car and charged at several people before it was pulled back, he added.

Critics of the Anaheim police are flooding Twitter with complaints of brutality and excessive force:

https://twitter.com/Deadprezz81/status/227227174099369984

Some protesters are advocating violence:

https://twitter.com/phattymoon/status/227217534506631168

A second police shooting occurred last night.

Earlier this morning, riot cops were reportedly on the scene:

https://twitter.com/PaliCali48/status/227316568923713536