Fights occurred minutes before Modi was set to speak.
Event is part of the lead-up to elections in West Bengal.
11 Indians charged in the US for orchestrating fake robberies.
Strategic angle: Violence breaks out in Kolkata as tensions rise before Prime Minister Modi's scheduled appearance.
Fights occurred minutes before Modi was set to speak.
Event is part of the lead-up to elections in West Bengal.
11 Indians charged in the US for orchestrating fake robberies.