A division bench of Justices A Selvam and Pon Kalaiyarasan reserved the order on the Habeas Corpus plea by G Thirumurugan, leader of the movement, and three others, to be delivered on September 19.
The members of May 17, including the petitioners, were arrested for holding a memorial for the Tamil victims of Sri Lankan ethnic strife, at Marina here without permission.
Earlier, the petitioners had contended that the detention order was "illegal, unconstitutional and passed without due application of mind" and sought it to be quashed.
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