Security agencies have identified the owner of the two-wheeler in which the explosive material was planted at Zaveri Bazaar in Mumbai while some cyber experts are looking into an email which may have some cross-border links.
Union Home Secretary R K Singh said the investigation into the serial blasts in the metropolis was going on and several people were being questioned based on their "previous known linkages".
"This investigation is on. We have identified the scooter in which one of the bombs was planted," he told reporters on the sidelines of a function.
Asked whether there were any cross-border links to Wednesday's blasts, the home secretary said, "We have an email which originated elsewhere. It is being followed up".
Singh said the CCTV footages of the three blast sites were being scrutinised by the investigators and they were going through the 11 CDs made from the footages.
"Now, we have all the people and the faces. They have to be recognised by local people to see whether they are locals or outsiders. That process is on. There are 11 CDs which we have been gone through. It is a voluminous work," he said.
The home secretary said the people not recognised by the locals in the CCTV footage have been put through a database and they were being verified.
"Suspicious people are being verified. Various people with known linkages are being questioned based on our previous databases. This investigation is on," he said.
Asked whether the investigators were working on any definite leads, Singh said, "We have not yet zeroed in on any leads."
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