Question

during which event did police fire lethal rounds into a crowd of school aged children who were marching to protest injustice

Answer 1

The event you're referring to likely involves the Kent State shootings that occurred on May 4, 1970, when Ohio National Guardsmen fired into a crowd of students protesting the Vietnam War. However, it is important to clarify that this involved college students rather than school-aged children. Another relevant event is the 1968 Mexico City Olympics when protesters advocated for social justice; however, police did not fire into crowds of school-aged children at that time. If you are looking for a specific incident involving school-aged children, please provide more details for clarity.