[Mr. V]

By report, the manager "was assaulted by people in their party."

I see no details as to the nature of the assault: was it a push or shove, or something worse, such as a smack in the face with a closed fist?

While I am not minimizing the conduct of these clowns it seems to be unreasonable to expect the police to devote constant effort and resources (i.e., money) to solving the crime if there were no substantial injuries or other damages done.

If the assault was only a shove then this is likely "case closed."