Who films a mass? Are all masses filmed, or just this one?
All masses are not filmed, sometimes they will broadcast them.
And why are so many police at this mass?
What's your point? "Immigrants" is a stupid term to describe these people. A PhD scientist from India/Europe/China is not the same fucking thing as a drug dealer who snuck across the border or an african "refugee" from somalia or a radical islamic sympathizing truck driver from pakistan. Are you stupid enough to not see that?