"High profile acts of violence, particularly in schools, can confuse and frighten children who may feel in danger or worry that their friends or loved-ones are at risk. They will look to adults for information and guidance on how to react. Parents and school personnel can help children feel safe by establishing a sense of normalcy and security and talking with them about their fears."
-- National Association of School Psychologists
Keep Explanations Developmentally Appropriate
For Early Elementary Age Children - provide simple information and concrete examples balanced by assurances of safety.
For Upper Elementary and Early Middle School Children and Youth - answer questions and assist in separating reality from fantasy.
For Upper Middle School and High School Youth - Emphasize reporting concerns and how to get help.