Hundreds gathered outside Wisconsin State Capitol on Tuesday night despite the freezing temperatures to remember victims of a private school shooting that left one teacher and a student dead and wounded six others.

Investigators were still working on Wednesday to determine why a teenage girl opened fire two days ago at her private Christian school in Madison, Wisconsin, killing a fellow student and a teacher before taking her own life.

Police are investigating why a teenage girl brought a handgun to her small Christian school in Wisconsin and opened fire, killing two people and wounding several others a week before Christmas.