The incident was caught on video Friday.
An eyewitness at the restaurant during the fight told ABC13 Clear Brook and Clear Lake students were involved after Clear Lake beat Clear Brook 28-6.
Food fight at Whataburger possibly between rival high school students caught on video
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"Brook lost and destroyed Whataburger," Caleb Johnson, a Clear Lake student, tweeted.
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Clear Creek ISD released the following statement:
"We are investigating and will take the appropriate disciplinary action for those involved."