A federal judge on Friday ordered the immediate release of Rümeysa Öztürk, a Turkish Ph.D. student at Tufts University who had been held for six weeks in an immigration detention center, ruling that her arrest and continued confinement were unlawful and raised serious constitutional concerns.

The administration moved to deport Öztürk because she co-authored an op-ed for the student newspaper that was critical of Israel.

Rümeysa Öztürk, the Tufts doctoral student detained by ICE in Somerville earlier this year, will be released on bail as her immigration case is pending, a federal judge ruled Friday. The American Civil Liberties Union confirmed the news Friday afternoon.