Colleges and universities across the country say the visas of some international students have been revoked in recent days without notice, causing confusion on campuses and panic among students, some of whom have filed lawsuits.

At least 147 international students were abruptly stripped of their ability to stay in the United States in recent days, according to universities and media reports, sowing fear among students.

The terminations affected six current students and seven alumni who received employment extensions of their visas, UW-Madison said.