Federal agents swooped on the members of the Hurriyat movement in raids across New Delhi and Kashmir's main city of Srinagar on Monday.
The Kashmir valley has been reeling from street violence since the killing of Burhan Wani by Indian forces last July.
A Delhi court on Tuesday remanded them in police custody for ten days, the Press Trust of India reported.
Those arrested include the son-in-law of Syed Ali Geelani.
The Hurriyat said the arrests were "revengeful, arbitrary and illegal" and called for mass strikes Tuesday.
Geelani, as well as another top Hurriyat leader Mirwaiz Umar Farooq, were put under house arrest in Srinagar and other parts of the city were under curfew.
More than 100 protesters, mostly young men, have been killed since last year in clashes between troops and police and Kashmiris.
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