A Texas school district has reportedly issued a letter to parents on Wednesday warning parents that members of the Border Patrol may be boarding the bus and asking students questions about their citizenship status.

As Immigration and Customs Enforcement (ICE) arrests continue to take place around the country, a school district in Texas has warned parents about the possibility of U.S. Border Patrol agents checking the immigration status of students on school buses traveling for extracurricular activities.

According to a social media post by the 27th Chief of the U.S. Border Patrol, Michael W. Banks, they dismantled the operation by arresting four smugglers and apprehending eight undocumented migrants, some from Mexico and others from Ecuador and Guatemala.

The Border Patrol’s El Paso Sector has a new interim chief patrol agent. Walter N. Slosar is now head of the sector that stretches from the eastern edge of El Paso County to the New Mexico-Arizona state line.