According to highly placed sources some local terror modules, with the help of people outside Maharashtra were involved in carrying out the high-intensity bomb explosion at the German Bakery.
Expecting a breakthrough, sleuths have spread in other parts of the country, including Karnataka to question some people who can be instrumental in the investigation.
"Investigation is on right track. More or less we have identified the people behind the blast. It has some links with Headley's visit to Pune," a senior official said.
Headley, who is at present is under US custody, had been to the Osho Ashram twice, during his visit to India in 2008-2009, which is located near the blast site, German Bakery in Koregaon Park.
So far 11 people have been reported dead and over 50 people were injured in the Pune blast on Saturday, Feb 13.
Investigators said that Headley had gone to Pune from Goa to conduct a surveillance of the area around Koregaon Park, where a Jewish prayer house is located.
The CCTV footage failed to provide any significant lead as the coverage of the area outside was limited only to the time around 6:30 pm before the attack, which included the two suspects coming from opposite direction and leaving the shop after 10 seconds of exchanging greetings.
On Feb 17, four Kashmiris were arrested in Karnataka in connection with the blast.