Footage of the altercation, which surfaced on Snapchat earlier this week before spreading to other social media platforms, shows the three students engaged in a round of fisticuffs before the school administrator steps into the cafeteria fight, which broke out at roughly 7:10 a.m. local time.
Failing to break apart the warring parties, Oakville High School Assistant Principal Brian Brennan is seen repeatedly getting punched and kicked as other students look on. Two of the arrested minors were 16 years old, and the third was 15.
The offending students are expected to appear in St. Louis County Family Court. Though no charges will be filed since they are minors, they will be expelled from the school, Missouri station FOX 2 reported.