A Pennsylvania superintendent has described his unique measure to protect students from potential school shooters – arming them with buckets of stones.
Blue Mountain School District Superintendent David Helsel told state lawmakers earlier this month that some classrooms had been given river stones to throw at attackers.
He said the stone defence was intended as a last resort if evacuations failed.
The unlikely defence was revealed amid a national discussion on gun violence.
The national gun debate was re-ignited after 17 people died in a school shooting in Parkland, Florida, last month.