A deadly cocktail of low-intensity explosives and kerosene bombs were used to
trigger the blasts in the Delhi-Attari special train, which claimed the lives of 65 passengers, preliminary investigations have revealed.
Forensic experts who collected samples from the scene of blasts were of the view that low-intensity explosives like sulphur or nitrate were used to trigger the explosions and kerosene-filled bottles kept in the bogies were used as a catalyst to spread the fire.
The experts have recovered several kerosene bottles, 3 pipe bombs and some low-intensity explosive devices from other compartments of the train, which caught fire at midnight.
"The modus operandi is new. They had used low-intensity explosives to trigger the blast and kerosene to ignite the fire. The idea it seems was to cause large-scale destruction by fire," J S Mahanwal, Director Forensic laboratory Haryana, said.
Forensic experts said they are yet to find out whether a timer device or some other equipment like flash