Men wearing street clothes identifying themselves as “the police” whisked away an international graduate student at Tufts University in Massachusetts after she co-authored an op-ed critical of Israel.

Rumeysa Ozturk, a Turkish citizen in the U.S. on a student visa, was detained on Tuesday in Somerville by two men wearing street clothes and masks. In a video posted on social media by the Council on American-Islamic Relations, Ozturk is seen walking down a sidewalk when she is stopped by a man wearing a hat and hoodie. After saying, “Hi, ma’am,” the man – who did not appear to flash a badge of any kind – seizes her phone as a second man approaches. Those two men eventually handcuff her as others, wearing masks, stand guard.

At one point, one of the men can be heard saying, “We’re the police,” but he did not identify an agency or department.

“You don’t look like it,” a bystander can be heard saying. “Why are you hiding your faces? Why are you hiding your faces?”

One bystander told The Boston Globe that Ozturk informed the men, “I’m a student.” The paper said the bystander spoke on condition of anonymity “for fear of retaliation from the government.”

“We are unaware of her whereabouts and have not been able to contact her,” Ozturk’s attorney Mahsa Khanbabai told The New York Times. “No charges have been filed against Rumeysa to date that we are aware of.”