Rajendra Kasawa's wife, son and daughter were released yesterday by the police after being interrogated in connection with the Jhabua blast incident.
A case was registered against Kasawa for keeping gelatine sticks in his house, which ultimately resulted in the explosion.
Explosives were found in a godown owned by Kasawa, who absconded after the explosion.
The death toll in the blast reached 89 and around 100 people were injured in the accident.
