The mastermind, a cook in the neighbouring house of the CE block residence, Sitaram Das and five others -- Pappu Yadav (22), Manoj Kumar Das (18), Rajesh Kumar Yadav, Raja Halder (34) and Tapan Purkait (28) were arrested by Bidhannagar Police late last night, DCP Santosh Pandey said.
Sitaram, Pappu, Rajesh and Manoj, all residents of Bihar's Banka district, were arrested from Kestopur area while Raja and Tapan were held from Jharkhali and Kultali areas respectively last night, he said.
Police suspected Sitaram after he disappeared from the locality following his grilling by the sleuths, a day after robbery took place.
It was also learnt that Pappu had earlier planned the crime 10-15 days ago but because of being "novice" they had dropped the idea on that day, Pandey said.
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On Friday, Pappu again regrouped everybody and after Amarnath Chakraborty left the house in the evening, they went committing the crime and left for their workplaces after.
Sources in the Bidhannagar Police said that some of the looted items were recovered from the arrested while many others were still missing.
During investigation, the police recovered toy guns from the house but the CCTV footage from the area failed to help them in their probe.
A gang of around eight miscreants looted valuables worth over rupees ten lakh from Amarnath Chakraborty's house in CE block of Salt Lake last Friday.