Two persons were killed in clashes in this central Maharashtra city on April 11 and 12.
"There was a month-long unrest over the municipal corporation's crack-down on illegal water connections and some other civic issues in the area (where the violence started)," he said.
The special investigation team of city police found petrol bombs and balls of kerosene-soaked balls during searches, suggesting that the violence was pre-planned, he said.
Police also found stones, collected for hurling through catapults at police or rival groups, he said.
Over 50 persons have been arrested following the violence.
Laxminarayan Bakharia alias Lachchu Pahelwan, alleged mastermind of the violence, was held two days ago. Before that, Shiv Sena corporator Rajendra Janjal and All India Majlis-e-Ittehad-ul Muslimeen (AIMIM) corporator Feroz Khan were arrested.
The violence left a 65-year-old man and a 17-year-old boy dead and around 60 others, including a dozen policemen, injured. Several shops and vehicles were gutted.
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