Delhi Police have tumbled upon Kalra's alleged links to bookies in London and Dubai and it has also been found that the businessman had close ties with actor Vindoo Dara Singh, who is facing charges in the IPL match fixing case.
Kalra's phone records suggest he was in constant touch with people in Dubai, Jaipur, Mumbai and London, police said.
A day before the robbery, Kalra had spoken to a Dubai number for around 20 minutes, police sources said.
"We also questioned Kalra's business partner Rahul Ahuja, but there is still no breakthrough in the case," said a senior police officer.
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Police suspect that among Kalra's contacts were Chandresh Jain alias Jupiter, a Jaipur-based bookie who was arrested over the IPL spot-fixing scandal, and London-based bookie Sanjeev Chawla, whose name had cropped up as the main fixer in the 2000 Hansie Cronje match fixing case.
With reports emerging of Kalra's strong connections with betting circles, police are also probing any possible betting racket related to the ongoing India-New Zealand cricket series.