NEW YORK — The Trump administration has revoked the visas of four more international students at Columbia University in recent days, the school announced late Sunday.

Reasons for the cancellations were not clear. The federal government has terminated the visas of hundreds of foreign-born students involved in the pro-Palestinian protest movement that engulfed college campuses last year — though not all of them. Others have claimed to be caught in the crosshairs or targeted for criminal infractions, such as “minor traffic violations,” said Columbia Provost Angela Olinto.

“The University was not notified of these status terminations and only became aware of them through proactive daily checks” in a federal database by Columbia employees, Olinto wrote to students and faculty.

A Columbia spokeswoman would not comment on the students’ participation in campus protests, if any — citing federal privacy laws. U.S. Immigration and Customs Enforcement did not immediately return a request for more information.

The latest wave of visa cancellations followed prior immigration enforcement activity against three Columbia students: pro-Palestinian activist Mahmoud Khalil; Yunseo Chung, who moved to the United States when she was 7 years old; and Ranjani Srinivasan, who has since fled the country. Both Khalil and Chung hold green cards. Srinivasan says she was caught in a campus rally as she was heading home but not an active protester.

Olinto said Columbia employees are notifying students as they become aware of any change in their immigration status and connecting them with resources, such as external legal assistance. Students with “pressing concerns” were also encouraged to notify their advisers, who they said would schedule same-day appointments.

Columbia students have accused Columbia of not doing enough to keep their classmates safe from immigration enforcement authorities. Last week, protesters chained themselves to campus gates after allegations surfaced in Jewish media that Columbia trustees had reported Khalil to the federal government before his arrest. (Columbia has denied the claim.)

“The University deeply values our international scholars and students,” Olinto wrote in the Sunday memo. “Our international community is essential to driving excellence in scholarship and research at Columbia and we are committed to supporting all members of our community.”

The termination of student visas and green cards come during a period of anxiety and upheaval at Columbia.

Late last month, Columbia made concessions to the Trump administration in a bid to restore $400 million in federal grants and contracts, which the government said it was canceling over campus antisemitism. A week later, the university’s interim leader, Katrina Armstrong, resigned, saying she could “best serve” Columbia in her previous position at its medical center.

But after a seeming change of heart, the Columbia University Irving Medical Center said Sunday that Armstrong “decided to take a sabbatical and spend time with her family,” and would not return this semester to leading the Washington Heights campus.

The short, two-sentence announcement did not provide a reason for the about-face. Hours later, the Wall Street Journal reported Armstrong faced antagonistic questioning by the federal government on April 1, just days after she stepped down.

The federal funding has yet to be restored.

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