TEHRAN, Young Journalists Club (YJC) -Armed security officials stood guard in and outside the centers amid fear of violence.
The voting on Sunday also covers Modi's constituency of Varanasi, a holy Hindu city where he was elected in 2014.
He has adopted a nationalist pitch in trying to win votes from the country's Hindu majority by projecting a tough stance against Pakistan, India's Muslim-majority neighbor and archrival.
The Congress and other opposition parties are challenging him over a high unemployment rate of 6.1% and farmers' distress aggravated by low crop prices.
Counting of votes is scheduled for May 23.
Source: AP