Investigations into three bomb blasts in Haryana since January this year have shown that the improvised explosive devices (IEDs) used in the blasts got better by the day, indicating the possibility of a bigger operation being planned, central counter terror officials told Hindustan Times.
Investigators suspect that all three blasts might have been part of an “experimental run”.
On Thursday last week, an IED fabricated using an airtight tiffin box made of plastic exploded in a Haryana Roadways bus near Pipli in Kurukshetra district, injuring eight persons.
Before that, two more IEDs exploded in empty trains in Panipat on January 15 and May 12 this year. No causalities were reported in the two blasts.
“In the first two IEDs, the container was tied with a wire but in the third (attack), a surgical plaster was used to pack the IEDs. In the first two IEDs, the filament used in car cigarette lighter was used to ignite the explosives. But in the third, two filaments were used. In all, 12 volts batteries were used as the power source. All IEDs had alarm clocks as timer,” said a counter terror official.
The batteries used were manufactured by a popular brand in Baddi, Himachal Pradesh.
“We have managed to get the serial number of the battery and investigators are trying to find the place from where they were procured,” said the official.
Forensic examination has shown that the IEDs had similarities to bombs used to carry out serial blasts in the Patna rally of BJP’s then prime ministerial candidate Narendra Modi in October, 2013, sources said.
In all the three IEDs, investigators have found a mix of potassium chlorate, aluminum powder and sulphur.