Glenn Rice has the full story here. Two of the girls had to go to the hospital for drinking too much alcohol. The most illuminating part of the prosecutor's press release:
When officers arrived, they found six 13- or 14-year old girls. Statements from several of the girls indicate they had been drinking heavily. ... Officers found 60-70 empty beer bottles and several empty bottles of bourbon, vodka, and whiskey scattered throughout the basement of the residence.