The violence started when a cop killed an unarmed man who was lying face down. It didn't start when some windows got smashed.
And, at the end of the article:
"Federal law enforcement were also reported to be looking into whether Mr. Grant’s civil rights were violated in his killing".Seems like an oddly detached way to phrase it.
I used to live in this area, from the Fruitvale district to downtown. It's really diverse culturally, with an interesting working-class Oakland vibe that underlays everything.