The first knock at the door came eight days ago, on a Friday morning.

Three federal immigration agents showed up at a Columbia University apartment searching for Ranjani Srinivasan, who had recently learned her student visa had been revoked. Ms. Srinivasan, an international student from India, did not open the door.

She was not home when the agents showed up again the next night, just hours before a former Columbia student living in campus housing, Mahmoud Khalil, was detained, roiling the university. Ms. Srinivasan packed a few belongings, left her cat behind with a friend and jumped on a flight to Canada at LaGuardia Airport.

When the agents returned a third time, this past Thursday night, and entered her apartment with a judicial warrant, she was gone.

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