More than 170 students in University of Texas System schools have had their visas revoked by the Trump administration, officials confirm.

While not all the affected schools said immigration status changes were tied to activism, they come as the Trump administration cracks down on students who protested Israel’s war in Gaza.

Officials at Texas A&M University and the University of Texas at Austin discovered that several international students had their visas quietly revoked and legal statuses terminated without notice. According to the Associated Press,