A part of the booty was also recovered from the accused, Thane Police Commissioner Param Bir Singh told reporters here.
He said 15 more persons were involved in the dacoity and police teams have fanned out across the country in search of them.
Gold jewellery weighing around 28.686 kg, valued at nearly Rs 7.22 crore, was stolen from Manappuram Finance's gold loan branch in Ulhasnagar township on December 26 last year.
The incident was reported by the company's staff to Vitthalwadi Police Station. The crime branch of Thane Police had also started a parallel investigation in the case.
Subsequently on January 4, police arrested two of the accused Kamruddin Asuddin Shaikh (28) and Manoj Nurbahadur Saud (35), police said today.
Based on a tip-off, police laid a trap and yesterday managed to nab the mastermind--Mustafa alias Akhtar Samsher Shaikh (44)--at Turbhe in Navi Mumbai, Singh said.
Around 3 kg of gold jewellery was recovered from the three men, they said.
Singh said the gang's modus operandi was to plant a security guard at the target place and with his help, gather information and commit the offence. In this case also, they had planted a security guard some days prior to the heist.
The gas cutters used for the robbery were brought from Kolkata and some other equipment was procured from Kurla, he said.
Police are trying to find out if the stolen jewellery has been sold and they would also trace the buyers.
To a question, Singh said jewellery shop owners need to get their security staff verified with local police.
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