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(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.