Police officers probing Wednesday's serial blasts in Mumbai haven't come up with any definitive leads yet but were pinning hopes on tracking the owner of a scooter in which the bomb was hidden at Opera House, one of the three localities which were hit.
Central government sources said investigators were questioning people on the basis of their "previous known linkages", analysing call records, scouring the footage from the CCTV cameras and trying to establish the origin of an email sent to a television channel soon after the blast for leads.
Union home secretary RK Singh — who conceded that investigators had not zeroed in on a definitive lead so far – indicated that the police had got the chassis number of the scooter on which a bomb was planted.
Sources said this would enable the police to track down the registered owner of the vehicle.
Sources said they had not been able to clearly identify anyone planting the explosives from the CCTV footage. Singh said, "There are about 11 CDs (of footage) which have to be gone through. We have all the people and their faces (can be seen clearly). They have to be recognised to see whether they are locals or outsiders. That process is on"
The home ministry has told investigators to take a look at an email sent to a TV channel, purportedly from a terror wing of an unknown group espousing the cause of separate Telangana, taking responsibility for the blast.