A letter sent to Alice ISD parents Wednesday said a student may be detained and possibly deported if they cannot prove they are in the country legally.

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.

CBP has permitted some Texas National Guard Troops to make immigration arrests as encounters along the border remain at historically low levels

The accord will expand the Trump administration’s footprint by deputizing National Guard members as immigration agents.

That policy change was made official Sunday after Abbott and Pete Flores, the acting commissioner of U.S. Customs and Border Protection, signed a memorandum of understanding that grants Guard troops the expanded authority.