The students from O'Connor High School in Helotes and Brandeis High School in San Antonio apologized alongside their principals Monday for the Saturday food fight at the Whataburger location in San Antonio, KENS-TV, San Antonio, reported Tuesday.
The restaurant said some students also came into the eatery to apologize in person.
Whataburger released a statement following the incident.
"We understand that this act was an emotional moment between a small group of students and not representative of the entire student population. The Whataburger team will continue to welcome Brandeis and O'Connor students at our restaurants and we're also committed to continuing the partnership and support both high schools," the statement said.
Northside Independent School District spokesman Pascual Gonzalez said officials are investigating the incident.
"Campus administrators will review videos to identify students who will face appropriate consequences including suspension from school. NISD will also cooperate with law enforcement and restaurant management in pursuing criminal charges if warranted," he said.