Rumeysa Ozturk, a Turkish doctoral student at Tufts University, was taken into custody by immigration officials on March 25.

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

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