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 F-1 visa revoked. The Department of State acknowledged the revocations but still won't say why they were revoked.

Ten international students have had their visas revoked by the U.S. Department of Homeland Security across Colorado universities. The University of Colorado released a statement confirming that F-1 visas issued to four international students on its Boulder and Colorado Springs campuses were revoked.