According to media reports, the Mumbai ATS is in an attempt to find leads into the Mumbai blasts.
A list of passengers chart will be provided by the Kolkata police to the Mumbai ATS. The Mumbai ATS suspects the hand of an India Mujahideen extremist in the terror blasts.
The ATS became dubious after the key suspect went missing after the blast.
The Mumbai ATS meanwhile reached Ahmadabad to investigate further on the probe and grilled Danish Riyaz, the main accused in Ahmadabad attacks in 2008.
The police have also successfully tracked the owner of the scooter in which the suspects hid the bomb at Opera House. The owner named Bhagchand Das Jain is a Byculla resident in Mumbai.
The scooter was registered in Mumbai. "This investigation is on. We have identified the scooter in which one of the bombs was planted," Union home secretary R K Singh said.
The bombs used were Improvised Explosive Devices made with ammonium nitrate and fuel oil, called ANFO. Sources added that according to experts, it is difficult and dangerous to travel long distances with the prepared IED as it is unstable and can go off by even a slight spark.