Bomb circuit handiwork of an engineer

The circuit used to trigger the July 12 blast at minister Nand Gopal Gupta Nandis residence in Allahabad has never been used in the country before.

The circuit used to trigger the July 12 blast at minister Nand Gopal Gupta Nandis residence in Allahabad has never been used in the country before. Its design shows a certain degree of expertise which is uncommon.

Officials said the circuits used in earlier blasts were the handiwork of electrical mechanics,but the one used in Allahabad had features which suggested that it was the work of an electrical engineer. A common electrical mechanic cannot apply that method to connect the circuit with the explosive,an official said.

The official said it was a common circuit used in remote-operated electrical devices. It had a relay,and three capacitors. A 12-volt battery was used for energy supply. Normally,bombs assembled by Indian Mujahideen (IM) men always have 9-volt batteries.

A step-up transformer was required in the circuitry to generate 220 volts of current to the detonator. Since there was no space left on the board for a transformer,the circuit maker used a novel improvisation which indicated there was an engineer at work.

The investigating agencies are yet to ascertain the specific details about the detonator,he said. The circuit was connected through the headlight of the Sunny Zip vehicle and the bomb was planted in the front part of the vehicle.

The Special Task Force and the Anti-Terror Squad are awaiting reports from the Central Forensic Science Laboratory (CFSL) to get a confirmation about the nature of explosives used. The investigating officials have some doubts about the Agra FSLs finding that the bomb contained RDX.

Stay updated with the latest - Click here to follow us on Instagram