An armed bystander stopped a shooting at a school in Bend, Oregon, prompting renewed discussion about the rare occasions when an armed civilian brings an attack to an end.
Experts are examining the circumstances surrounding the intervention and how often armed bystanders have halted school shootings. The incident has also drawn a response from gun rights groups.
The Bend shooting is being considered as part of a wider debate over the role of armed civilians during attacks, with experts stressing how uncommon such interventions are.
