Police in Sparks, Nevada, say the two people killed in a school shooting were a staff member and a student who was likely the attacker.
Two other students were critically injured in the violence that erupted before classes began Monday. Authorities said the staff member was trying to intervene.
Students from the middle school and next door elementary school were evacuated to the nearby high school, and classes were canceled.
Sparks is a city just east of Reno.