Yunseo Chung, a legal permanent resident who has lived in the U.S. since she was 7, participated in pro-Palestinian demonstrations. Immigration agents visited residences looking for her.

Columbia University student Mahmoud Khalil is being held in an immigration detention facility in Louisiana more than a thousand miles away from where the 30-year-old was arrested in New York in early March. Here’s what to know about the Central Louisiana ICE Processing Center, where he’s being detained while he fights to stay in the U.S.

Here in New York, Jewish students chained themselves to Columbia University’s gates Wednesday to demand the school reveal the names of trustees and Columbia officials who collaborated with federal immigration authorities in the arrest last month of student protest leader Mahmoud Khalil.