Srinath from Chikkaballapur, Venkatesh from Kandavara, Thimmaraju from Susepalya and Manjunath from Vapasandra are the arrested.
Pharmacists in the city had complained to the police on Monday that the family had attempted to commit suicide as they could not bear the harassment meted out to them by the pawn brokers.
One member of the family died and the others are still critical.
Following the complaint, police arrested the four and presented them before the court.
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