Nineteen years later, remembering how terror struck Mumbai's lifeline on July 11, 2006.
The parade was carried out in front of an executive magistrate in the Thane Central Jail recently.
Faisal Sheikh, Tanvir Ahmed, Kamal Ansari and Ehtesham Siddiqui were booked under MCOCA
The revelations came during scientific tests carried out on them.
Faisal Sheikh, a prime accused in the July 11 train bombings in Mumbai, has confessed to police that he had gone to Pakistan in 2002 and attended a training camp near Muzaffarabad.
Two more suspects in the July 11 serial train blasts in Mumbai were on Thursday booked under the stringent Maharashtra Control of Organised Crime Act.