The assailants allegedly belonged to 'Shivba Sanghatna, police said.
The incident took place at about 1.10 pm when the accused of Kopardi case were being taken to police van after a court hearing.
Four persons tried to attack them with sickles, but the police intervened quickly and took them in custody.
Those detained were identified as Amol Khune Patil (25), Baburao Walekar (30), Ganesh Khune Patil (27) and Rajendra Patil.
A case of attempt to murder and assault would be registered against them, the police added.
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