A senior police officer, who is a member of the probe team, today said that they are trying to put together all the pieces of the jigsaw puzzle to figure out the behavioural pattern of the 35-year-old accused with the help of several mental health experts and criminologists to arrive at a conclusion as to what led him to execute the mass murders and whether he was a victim of a spilt or multiple personality.
Now, police are trying to locate the pharmacist from where the medicines were procured and the doctor who prescribed them, he said.
According to police, even though locals remember Hasnain as a good-natured and religious man, his dark side came to light on Sunday when he mercilessly butchered 14 his family members and then ended his life after a weekend feast.
In the last couple of days, the police team has been recording statements of Hasnain's relatives and friends besides the caretaker of the Pardesi Baba Darghah (also known as Durgha Hazrat Gaji Salauddin Shah Baba) which he used to visit often.
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When contacted in this regard, the caretaker, however refused to make any comments.
Police had also learnt from neighbours that Hasnain used to slaughter goats for 'kurbani' (sacrifice) ritual and therefore knew how to use a butcher's knife that was used in the crime.
A police official from Kasarwadavali station said they have collected the blood and nail samples of the lone survivor of the incident, Subiya Barmar.
In a chilling testimony, a traumatised Subiya (22)
Meanwhile, an uneasy calm prevailed at the 'Warekar Manzil' (Hasnain's house) in Wadavali. The residence that was a mute witness to the abominable act, has been sealed by police and it would be handed over to relatives only after the probe is over and an abatement summary report filed before the court, the official from Kasarwadavalli police station said.
Rajesh Gavli, one of the villagers who knew the family very well told visiting newsmen that Warekars displayed a very good conduct and never got involved in any issues.
"How this happened is astounding," he said.
A local Congress leader and the first elected Municipal Corporator of the Thane Municipal Corporation Janardhan Atmaram Patil was also acquainted with the Warekars.
"I have been here for years together. The family was a respectable one. Hasnain rushed to help anyone who was in need. Even when I was the village sarpanch and corporator I knew them very well and was in close contact with them. The family had no issues. They did not not have any property disputes. What drove them to this is unimaginable", he said.
According to police, Hasnain, a commerce graduate, used to prepare Income Tax-related documents with a CA firm in Navi Mumbai and did not have any permanent job.