City DCP Sanjeev Arora said one Sulekha Sahoo alias Sula was arrested following raids conducted in his Ranihat house on Sunday night.
"Three firearms, including a sophisticated pistol and 15 live ammunitions were seized from his possession," Arora said adding, the accused was involved in two criminal cases.
The police on Sunday night had also conducted raids in the house of another associate of the brothers at Badambadi area. Since the suspect, who is alleged to have business links with the gangster brothers was absconding; a manhunt is on to nab him, the police said.
The brothers would be physically produced before the court on Tuesday.
Officials said while the court was likely to hear the remand petition on Tuesday, it was also likely to hear the petition filed by Dhalasamanta brothers' counsel.
The siblings - Sushant and Sushil - were arrested on January 29 last for their alleged involvement in abduction and murder of their two former estranged associates, in November 2013.
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