Police arrest at least 20 demonstrators , CNN affiliate reports . Mall management warns organizers not to hold the event on its private property . Hundreds chant , throw up their arms and sit down to the dead . As protesters unfurled banners of `` hands up , do n't shoot , '' the mall answered with a video wall message in all caps reading : . `` This demonstration is not authorized and is in clear violation of Mall of America policy . Mall of America claims it 's the nation 's largest .
Police arrest at least 20 demonstrators , CNN affiliate reports . Mall management warns organizers not to hold the event on its private property . Hundreds chant , throw up their arms and sit down to the dead . Mall of America claims it 's the nation 's largest .