An Iranian-American graduate student from Los Angeles has been detained for nearly two weeks by the Iranian authorities, a Foreign Ministry spokesman, Hassan Ghashghavi, said Tuesday. The student, Esha Momeni, was in Iran to visit relatives and do research on women's rights when she was arrested on Oct. 15 while driving in Tehran, according to Amnesty International. Iranian officials said initially that she had been arrested for a traffic violation. But Amnesty International said that after being stopped, Ms. Momeni was taken to her relatives' home, where her computer and research materials were confiscated.