SchoolShootingTraining
A group of Marysville police practice a "diamond" formation to protect Marysville fire department personnel during training at Grove Elementary School in Marysville, Washington on Tuesday, Aug. 9, 2016. Under new protocol, paramedics will be escorted by law enforcement into a "warm zone", an area checked by but still considered dangerous by police, to provide critical care within the first hour of a mass casualty event.