New audio is giving us a glimpse into the terrifying scene inside a Washington high school last month, where a student killed four classmates and wounded one more.

In one call, you can hear a teacher named Whitney Silberberger, who has been hailed as a hero for staying with her students in the cafeteria and attempting to stop the shooter, 15-year-old Jaylen Fryberg, before he committed suicide. 

Watch Jonathan Hunt's report above and hear some of the chilling 911 calls.

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