Multiple universities contacted by the USA TODAY Network regarding the visa cancellations declined to discuss specifics, citing student confidentiality. Immigration experts said they've never seen the federal government make such sweeping changes to the ordinarily low-profile process of hosting international students.

The administration has not provided a reason for most cases, but some students have been targeted because of their pro-Palestinian activism.

Over the past week, nearly 300 full-time international students across the country were informed that their visa status had been revoked.

We are not aware of the details of the revocations or the reasons for them, but we understand these actions continue to take place at other institutions across the country," Harvard said in a post Thursday.

"We are deeply troubled by the escalation of immigration enforcement activity toward our international students."

The university was not notified and only learned of the changes by proactively checking a government database.

The Trump administration revoked 15 Texas A&M students' visas, at least 2 at University of Texas. Students protest, demand more information from UT.

Hundreds of foreign students across the US have had their visas revoked suddenly and without explanation, lawyers say.

New York colleges are reporting student visas have been abruptly revoked by the Trump administration — with at least some 50 international students affected statewide as part of a nationwide