UPDATE: Police say it was a student who opened fire at a Nevada middle school Monday morning, killing a staff member who was trying to protect other children.
The suspected gunman also is dead, but authorities say no shots were fired by law enforcement, though more than 150 officers responded.
The shooting erupted outside Sparks Middle School shortly before classes began Monday morning. Two other students were critically injured in the incident. They were both taken to a nearby hospital, where one is out of surgery. Police say the other is doing well.
UPDATE: Police in 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.