The U.S. Department of Homeland Security accused Ozturk, a Turkish national, of "activities in support of Hamas."

Friends of Tufts University graduate student Rumeysa Ozturk, who was arrested in Somerville last week by Immigration and Customs Enforcement agents, are speaking out.

Tufts University graduate student Rumeysa Ozturk, a Turkish national, was detained by federal immigration authorities late Tuesday, according to her attorney and activists.