According to preliminary investigation into Tuesday's incident, terrorists had used low-grade explosive material, including sulphur and pottasium cholorate with sulphuric acid, to detonate the blast, official sources said.
This modus operandi was used by Tunda in late 1990s and early 2000s to set off explosions in various parts of the country, especially in Uttar Pradesh. This technology is a crude way of assembling explosive material where an acid is used as a triggering mechanism to detonate a blast.
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