( CNN ) -- Iranian intelligence officials have detained the sister of Nobel laureate Shirin Ebadi , the Iranian lawyer and human rights activist said . Ebadi said Monday that three men and a woman arrived at the Tehran home she shared with her sister , searched the house and seized Nushin Ebadi , 47 , and her computer . `` They have detained her so I stop my work , '' Shirin Ebadi , 62 , told CNN 's Reza Sayah in a phone call from London . `` She has done nothing wrong . She 's not involved in human rights work , and she 's never participated in any of the protests . '' Nushin Ebadi 's arrest came in the middle of a deadly crackdown on anti-government protests that has left at least eight dead , according to the Supreme National Security Council , although the Iranian government denies its forces have killed anyone . Shirin Ebadi , who won the Nobel Peace Prize in 2003 for her human rights work , left Iran for a conference in Spain the day before June presidential elections that sparked an earlier round of violent protests . Friends , she said , warned her not to return to Tehran . The Nobel laureate said she spoke with her sister Monday , a few hours before the 9 p.m. visit by ministry officials while Nushin Ebadi was at home with her husband and two sons . Iranian Information Ministry officials contacted Nushin Ebadi several times previously , her sister said , telling her to leave their apartment and warning her not to contact her sister . Both women thought those demands were absurd . `` Not only does my sister not do any human rights work , she does n't do any cultural work either , '' Shirin Ebadi said . `` They only took her because of me . '' Information Ministry officials contacted Nushin Ebadi on Wednesday and told her to tell her sister to stop her work and stop saying the things she says , according to her sister . Nushin responded , Shirin said , that her sister was 15 years older and would not listen . Shirin Ebadi 's law firm represents seven members of Iran 's Baha ' i Community who have been charged with espionage . She said she is certain Iranian officials are trying to intimidate her by harassing her sister , but , she said , she will not back down . `` They want to intimidate me , '' she said . `` The only thing they want is for me to change my work . '' `` I am worried . I 'm worried because she [ Nushin Ebadi ] was detained because of the work I do , '' she said , adding it was that work that made Nushin a target . `` She 's not interested in this kind of work . She 's not involved in this kind of work . '' Shirin Ebadi said she advised her sister to contact an attorney when Information Ministry officials first began approaching her and that she did so . Nushin Ebadi and her husband are professors of dentistry at Azad University in Tehran , Shirin Ebadi said , and Nushin Ebadi 's husband also has a private dental practice .
Ebadi left Iran for a conference in Paris the day before June presidential election . Friends advised her not to return to Iran , she says . Iranian Information Ministry officials visited sister several times , Ebadi says .