Here is the recorded stream with the riot cops shoving everyone around. At 50:25 you can see a CNN reporter in the crowd reporting live. At 51:07 riot cops begin advancing and shoving everyone. At 52:01 you can hear that some are being knocked to the ground and are in danger of being trampled. At about 56:15 on the left, I believe that's the short-haired photographer seen in my "Show me what a police state looks like!" thread, with a bleeding head wound; Freedom comments "you're bleeding brother..."...so that's where he got it, for being peaceful. Cops even shoved the shit out of the pistashio-capped NLG Observers.
You can set the timer/marker where you want, you don't have to play it and wait for it to get there!
Remember that this was a peaceful assembly, a 1st Amendment rights assembly, and cops declared it illegal and threatened arrests and weaponry, and bloodied protesters.