Yes...it is Not made clear Who exactly were the "14 people (who) were arrested, and several dozen knives, bricks, sticks and other weapons were seized." 
"They said they wanted to make a stand against hate and racism" With knives and bricks?

I want that Information! Was it immigrant rights group members?, "religious (or) labor groups members"? WHO specifically? This information would go far in clearing up just WHO is doing WHAT. 
Information that the left-leaning Media does Not want us to know? It does fit their narrative.