An active-shooter training exercise "left teachers with welts, bruises and abrasions after they were shot with plastic pellets," according to

The incident went viral following tweets posted Wednesday by the Indiana State Teachers Association:

"Some safety researchers and school psychologists have said those types of drills unnecessarily traumatize children and may actually make them less safe if they act dramatically in a real crisis situation," according to Education Week:

National news organizations posted reports online using mostly file photos from previous school shooter training exercises across the nation: