The CID, which has taken charge of the case yesterday, will be visiting the spot in Hooghly where Upadhyay was shot dead last week, a senior CID official said.
A team of CID sleuths has already left for Patna, where they suspect that a few persons involved in the crime are hiding, the official said.
In another development, a team from Chandannagar Police Commissionerate arrested seven persons from a lodge at Varanasi in Uttar Pradesh for their alleged involvement in the killing.
At least of three of the seven are close aides of Upadhyay, sources in the Commissionerate said.
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Upadhyay, also a Trinamool Congress leader, was shot from point blank range by unknown gunmen last week in Hooghly while he was returning home on a motorbike.
Following the killing, the state government transferred Chandannagar Police Commissioner Peeyush Pandey and removed the officer-in-charge of the local police station.
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