No politician, even Obama, would be so stupid as to give that order. Not in an era where everyone can take cell phone videos.
And if the order was given, I'd hope that the police would be mighty slow in enforcing it. These are WW II vets, not Occupy Wall Street hippies.
If I were a cop there, I'd suddenly have a tummy ache and have to go home. Use up a sick day, and all that.