Hyderabad: The Forensic Science Laboratory (FSL) here found that Indian Mujaheedin (IM) operatives, who triggered the twin blasts at the popular Gokul Chat eatery and Lumbini Park Laserium, used time bombs for executing their operation successfully in August 2007.
They had planted bombs at three places – Gokul Chat, Lumbini Park and on a motorcycle in front of a shopping mall near Dilsukhnagar. While the bombs at Gokul Chat and Lumbini Park exploded, the one in Dilsukhnagar did not go off because of a wiring problem.
The FSL said that it examined the material objects submitted by the investigators after which a chemical analysis was conducted. The brownish cream coloured pasty substance that was recovered was nothing but ammonium nitrate emulsion explosive which was connected to electric detonators.
Two wires connected to an alarm buzzer with a clock mechanism and use of 9V batteries and metal balls resulted in the formation of an Improvised Explosive Device (IED) also called a time bomb in which a chain of detonation was included, a FSL explosive expert said.
The IED can endanger human life on explosion. The chemical detonators were destroyed in the interest of public safety, he said. The explosive substances that were carried in a carry bag were kept in a wooden box.
The elite anti-terrorist unit OCTOPUS, who are investigating the case, enclosed the FSL report with the chargesheet that was filed in the case booked after an unexploded bomb was disarmed after being recovered underneath the Foot-over-Bridge in Dilsukhnagar.
The case was booked based on a complaint lodged by the then Malakpet Traffic Inspector M. Prabhakar who received the carry bag containing the explosive substance from a motorcyclist. The motorcyclist noticed the bag hung to his vehicle underneath the FoB and handed it over to Prabhakar who found some wires connected to the parcel inside the bag and informed the bomb disposal squad. Prabhakar was clearing encroachments on the pavements when the motorcyclist handed over the bag.
The bomb squad had then shifted the bag to an open place between Gaddiannaram and Moosarambagh junctions and defused the bomb.