Nabeel Rajab, the president of the Bahrain Center for Human Rights, says Zainab al-Khawaja was detained early on Friday during the rally outside the capital Manama.
She is a daughter of Bahrain’s most prominent political activist, Abdulhadi al-Khawaja, who was imprisoned for life in June. A special security tribunal, set up under emergency rule, convicted him of anti-state crimes.
Bahrain’s Shiite majority has been campaigning for greater rights from the Sunni monarchy since February. At least 35 people have been killed since the uprising erupted.
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