A South Texas school district is warning parents that U.S. Border Patrol agents may be checking the immigration status of students as they participate in extracurricular activities. On Wednesday, the Alice Independent School District sent out a letter alerting parents that agents may be boarding school buses to question students about their citizenship status.

We want to bring to your attention an important matter regarding student travel for extracurricular activities, including sports, band, and other co-curricular events,” Superintendent Anysia Trevino wrote in the letter.