A ninth grade boy was arrested after stabbing a female student at Northgate High School in Walnut Creek, police said.
A text message was sent to parents by the Mount Diablo Unified School District on Tuesday afternoon.
The text said "Early this afternoon, there was a stabbing in Northgate High School. One student is in police custody and the victim has been taken to a local hospital. Both students involved were in the 9th grade and were acquaintances."
It's unclear what led to the assault or where it all started. But it ended at the back side of the school near some dumpsters.
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The district said no other students were involved.
"It's very scary, I think for a lot of people," said student Amelia Schreg. "It's definitely something that we need to look into and see what happened to stop it in the future."
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Students returned to class later in the day and counselors will remain on site through Wednesday.
"It's crazy, it's going on everywhere and you know?" said parent Ephram Cohen. "What is wrong with people? You know? I just don't get it. There's guns everywhere, there's mass shootings, nobody's doing anything about it. So, I don't understand, people are doing knives that's something else too."
The boy was arrested on attempted murder and mayhem charges. The other student is being treated for stab wounds.
