According to a senior officer of Kolkata Police, Abesh's friends, security guards, drivers and other inhabitants of the Sunny Park complex in the upscale Ballygunge area were questioned.
"The investigation is not yet over. We are interrogating people and are verifying their versions over and over again," he said, adding that some of the people were summoned to the Kolkata Police headquarter in Lalbazar.
A source said that sleuths probing the case were trying to construct the links which were "still missing" and hence the interrogations were on.
Earlier in the day, Abesh's mother Rimjhim Dasgupta met Mamata Banerjee seeking justice and said the Chief Minister assured her of help.
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"The Chief Minister told us to keep faith on her. She assured us that truth will come out. She said culprits will be traced," Abesh's mother told reporters after the meeting.
Dasgupta, who called on the Chief Minister along with other family members, said, "I told her that many questions still remained unanswered."
She maintained the CCTV footage did not have entire sequence of the events of that day.