A day after the Pune blasts, a team from the National Bomb Data Centre (NBDC) visited the blast site. They scanned the area near the McDonald's restaurant on Jangli Maharaj road where one bomb went off. Samples and other materials were collected from the scene.
According to preliminary investigations, ammonium nitrate is understood to have been used in the crude bombs. There are also reports that 7 improvised explosive devices (IEDs) were used. As per sources a timer, batter and iron pellets were used to make the crude bombs. A sticky black substance was also found in one of the bombs that the squad managed to detonate on time.
Union home secretary RK Singh has been quoted as saying, "The police over there is also investigating, but since there were four blasts we think investigation from our side is also important. So our NIA team along with NSG post blast investigation team will be in with the Pune police for further investigation."
The police team who were carrying out a recce of the area this morning collected material evidences like bicycles and dustbins were the bomb was placed as part of the investigations.
The CCTV footage has been collected by Pune police to ascertain clues on who was behind the blast. Initial reports suggest that one of the bicycles on which the bomb was planted was brand new.