16 dead, bombs used timers 'similar' to those in Aug '12 Pune explosives
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Investigators probing the two blasts in Hyderabad's Dilsukhnagar area suspect that the bombs were made of ammonium nitrate and used a fuel-oil booster, a quartz timer and aluminium casings. The timers are thought to be similar to those used in the low-intensity bombs that went off in Pune last August, they said Friday.
The first clues came as the death toll in Thursday's twin blasts rose to 16. Ninety people were wounded in the attack.
Investigators from the Andhra Pradesh police, the NIA and the NSG who reconstructed the explosions after visiting the sites found that the bombs may have used a quartz timer and aluminium casings.
A senior Andhra Pradesh police officer apprised of the efforts to reconstruct the bombs by AP explosives experts said the investigators had suggested possible similarities with the Pune blast.
"The National Security Guard has reported the finding of a quartz timer or an electronic clock of some sort. This is a bit like the Pune blast timers. But we are only saying at this stage that a timer device was used," an AP police expert said.
The two bombs were designed to direct the impact of the explosion towards cylinders and inflammable items kept in nearby eateries, in a bid to cause maximum damage. Preliminary findings also suggest that ammonium nitrate was used along with a fuel-oil booster in the bombs, which did not weigh more than 600 gm each.
It is believed the bombs, packed in aluminium containers, were positioned on bicycles to give them elevation and angled to target crowded eateries nearby. They are also believed to have contained batteries with 3-9 volts of power. "Fortunately the cylinders were not hit, otherwise many more could have died," said an officer. Most victims suffered head injuries and blacked out.
A team of NSG bomb experts who visited the blast site, however, said the "directional" nature of the bombs as well as the fact that they presumably had neither ball bearings nor shrapnel made them distinct from the failed Pune blasts. "The IEDs recovered in Pune were not directional and had ball bearings and shrapnel. This is a major difference. If the same terror module was involved in the blast, they have definitely changed their modus operandi," said one officer.