Ethan Persoff is covering the activities of the DNC riot police on his blog. Here's an excerpt from Day 2:
It's at this moment that the 'early big moment' happened. Just to repeat: the cops were caging these kids in, tighter and tighter. So a tall guy makes what seems to be a break for it. And that's where I happened to be in a good place for a very clear view. Due to our alley detour I was standing about fifteen feet from what happened. And it happened in such a quick blink of an eye that you'd miss it if you sneezed. My excuse for not having a photo is because just as I hit the shutter I swallowed in a gulp of pepper spray that misted through the air forcing me to recoil and lose the shot. But I'll happily go in a court of law to say I saw a guy with no weapons run at a bunch of police, immediately get shot with rubber bullets, and then receive what looked very much like a pistol whipping. The sound of clattering metal billyclubs on the pavement, indicating missed shots, is something I don't think I'll ever forget either.
Later after the incident I spoke to another witness who confirmed my assessment, though he's more graphic. He was in the crowd: "Yeah I saw it right there. The guy, he just, is tackled. And the cop he turned his gun around and BAM BAM BAM, he just bashes this guy's head like five times with the butt of his gun. And then the horses show up and the cops on those, they get their shot with those metal canes.