A 16-year-old student, armed with a shotgun, walked into a rural California high school on Thursday and shot one student and fired at others and missed before a teacher and another staff member talked him into surrendering, officials said.

The teen victim was in critical but stable condition, and the suspect, whose pockets were stuffed with ammunition, was still being questioned, Sheriff Donny Youngblood said at a news conference on Thursday.

The suspect used a shotgun that belonged to his brother and went to bed on Wednesday with a plan to shoot two fellow students, Youngblood said.