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.

Neither university has identified the students who lost their visas, said what countries they are from, or revealed whether federal officials provided any explanation.

At least six international students at Colorado State University and four at CU have had their student visas revoked this semester, officials said.