Things are still a bit sketchy, but, visit these two websites for what is known so far.
Crooks and Liars
Political Gates This one has a comment by the Anchorage PD confirming the Palin family was involved in a "disturbance."
Let's all pray someone captured video: Son Track Palin beating up a teenager; Bristol pounding on another guy; Sarah shrieking "Don't you know who I am?" Bloody noses, alcohol involved. And where was little Trig all the while?
Thanks, Gramps McCain, for inflicting this pack of trash on the nation.