Vallejo is the North SF Bay area (somewhat local for me- where the Mare Island Naval Shipyard is) The city went bankrupt in 2008.
It is true that most of the students at that school are black. This is right down the street from the high school. The worker was driving a backhoe and someone threw something at him. He came back and several students jumped him. Then about 40 people showed up and started beating him. They broke his jaw, skull, and he lost sevral teeth. they also robbed him. The worker in the station which had the cameras said they call the cops almost every day and they only show up about 30% of the time.