US shooting: 'I thought we were all going to die'

The United States is in mourning following one of the worst school shootings in American history.

A gunman shot dead 20 young children and six adults at Sandy Hook Elementary School in Newtown, Connecticut on Friday morning.

In an emotional interview for ABC, teacher Kaitlin Roig describes how she asked pupils to be quiet as they hid in a classroom, waiting to be rescued.