Esha Momeni, a student at California State University, Northridge, was driving on a highway in Tehran when she was stopped by authorities who said they were traffic police, the London-based Amnesty said.
Iranian officials said Momeni was arrested Oct. 15 for a traffic offense. But Amnesty said in a statement Tuesday she was taken to her family's home where her computer and other materials related to her research on the Iranian women's movement were confiscated.
Momeni, who is a member of the California branch of Change for Equality _ an Iranian women's rights group _ was later taken to Evin prison, the Tehran facility notorious for holding political prisoners, Amnesty said.
Her family was told by an Iranian court on Monday that her case was still being investigated, and no details would be released until after the probe was completed, Amnesty said.