Yasin Malik and others were taken into preventive custody after they took out a march from Maisuma to nearby Budshah Chowk, in violation of prohibitory orders and were lodged in Kothi Bagh police station, a police spokesman said.
He said they are being shifted to Srinagar's Central Jail.
A JKLF spokesman said over 50 activists and supporters of the group led by Malik courted arrest as part of the 'jail bharo' agitation to lodge protest against awarding of death sentences and lifers to Kashmiri prisoners and torture in jails.
Prominent among others who were arrested are Javed Mir, Abdul Majid Mir and Parveena Ahangar (chairperson of Association of Parents of Disappeared Persons), he said.