"Seven Virginia Tech students and two alumni at the state university in Blacksburg have had their visas revoked. 

President Tim Sands said in a letter posted Thursday morning that records for nine people, including three undergraduate students, had been terminated in the federal Student and Exchange Visitor Information System. 

The letter noted that when this occurs, it 'generally means they must leave the U.S. immediately.'

'We do not know why the terminations occurred and are seeking additional information from the State Department and Department of Homeland Security,' Sands wrote. 'At this time, we are not aware of any immigration actions affecting Virginia Tech faculty or staff,'" reports Cardinal News.

Photo: Student protesters march at Virginia Tech on Thursday. Photo by Wilbert Ramirez.