The revocations began last week and none of the CU students have been detained at this point, university spokeswoman Michele Ames said Wednesday morning.

Colorado State University said on Wednesday that an additional student had their visa revoked after several were revoked a day earlier. The Department of State acknowledged the move but won't say why they were revoked.

At least nine students between the University of Colorado and Colorado State University have had their visas revoked by the Department of Homeland Security, spokespeople for the schools have said.