Rangpur, Sept. 2 -- Police on Wednesday interrogated two accused for the second consecutive day in connection with the killings of former schoolteacher Ganapati Chakraborty, his wife and their two children, saying they are close to uncovering the mystery behind the quadruple murder.

A three-member Detective Branch (DB) team questioned Siddhartha Das and Mugdha Das at the gate of Rangpur Central Jail for three hours on each of the two days following a court order.

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"We hope we are now close to uncovering the mystery surrounding the murders," said Additional Commissioner (Crime and Operations) of Rangpur Metropolitan Police Tofael Ahmed.

The accused were inter...