Actually, they did not.
My wife and I sat from 10PM until 2AM watching the live news coverage.
Several times, there were live shots broadcast from the school parking lot, which was being used by the newsies to park their crew vehicles. I clearly recall one shot being a drive from one end of the lot to another, the camera was pointed at the opposite mall parking lot, but you could see newsvan after newsvan parked in the school's lot. Other live shots from the mall itself - acorss the street - were pointed at the school lot, and this confirmed that 10 or more newsvans had setup in the school lot.
There was no obvious LE presence at any time that I recall, except for the one instance where the LE with bloodhound dashed all the way from the mall, across Rt. 50, to the school lot.