The assault took place after Sena workers allegedly disrupted a programme organised by Somaiya wherein an effigy of 'corruption mafia in MCGM' was to be burnt to mark the festival of Dussehra last evening, they said.
"We registered an offence against Shiv Sena activists and arrested five people under IPC 324, 323, 504, 506 and relevant sections," said senior police inspector Madhav More of Navghar Police Station.
Those arrested early this morning include Kiran Nande (40), Nilesh Sawant (37), Nilesh Thakkar (42), Sunil Gore (41) and Kishore Bhoir (42), all residents of Mulund East.
However, police intervened and brought the situation under control, Ashok Dudhe, Deputy Commissioner of Police, said.
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MCGM is ruled by the Sena-BJP alliance for the last 20 years and civic polls are scheduled early next year.
Somaiya, a former Mumbai BJP chief, has aggressively targeted Sena and has repeatedly alleged that civic body was riddled with "mafia-raj and corruption".
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