A division bench of justices A Selvam and P Kalaiyarasan directed the Additional Public Prosecutor, representing the state government, to file an affidavit before August 3 when the habeas corpus petitions filed by the four came up for hearing.
G Thirumurugan, leader of the movement, and three others, submitted that they along with other members of the movement had assembled at Marina Beach here in May, to hold a memorial for Tamil victims of Sri Lankan ethnic strife.
Meanwhile, the City Police Commissioner passed an order detaining them under the Goondas Act on May 28, on the ground that they were involved in activities, prejudicial to the maintenance of public order.
The petitioners 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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The bench also ordered notice on another habeas corpus petition by J Vivek of Madurai seeking to produce his 45-year- old wife Padma in the court and set her at liberty.
When the matter came up, Additional Public Prosecutor told the bench that several criminal cases were pending against the woman and she was absconding.
The bench then directed the Q Branch Police to take appropriate steps and posted the HCP for further hearing to July 17.