硝酸铵
Ammonium nitrate was found to have been used as explosives, with 9 volts batteries as triggers. A total of seven IEDs were used in the blasts. Initially, the bomb disposal squad experts suggested that the moist weather may have reduced the intensity of the blasts. However, upon further investigation, it was found that while the bombs had been constructed to cause maximum damage and take many lives, a design flaw had prevented them from fully exploding.