Federal anti-terror agents joined local police in the western Indian city of Pune on Thursday to probe a series of low-intensity blasts the night before when the new home minister had been due to visit.
The four explosives went off in succession beginning shortly after 7:30pm (1400 GMT) on Wednesday, targeting a bustling restaurant and shopping area in the town in central Maharashtra state and injuring one person.
National security and forensic teams arrived in Pune early on Thursday and were examining two unexploded devices, the home secretary, RK Singh, told reporters.
‘Even though the blasts were very small, the fact that they happened in a one-kilometre area and went off in a 40 minute period shows that there was planning behind it,’ he said.
He said investigators were looking at possible ‘terror links’ to the blasts.
Local reports said ammonium nitrate was used in the devices that were hidden in cake boxes and thought to have been detonated with digital timers.