The bus was coming from Barpeta Road.
The Joint Commissioner of Guwahati, Diganta Barah said, "The kind of material used was in powder form. Glass pieces were also available but we are not sure which kind of explosive it was. We received the information and took the help of bomb squad to defuse it."
DCP Ramandeep Kaur also said, "It is really difficult to say what it exactly was. We are investigating the matter."
According to the sources, the bomb squad is yet to confirm the nature of the explosive device.