"People weren't allowed to file nominations. People from all parties except one ruling the state have suffered. Workers of these parties were killed. This is serious. A land as great as West Bengal had to see such things. It is unfortunate," Modi said.
He was addressing workers at the BJP central office here after the BJP emerged as the single-largest party in the Karnataka Assembly polls.
"Where is the spirit of democracy?" Modi asked.
"It is not just about winning elections. All political parties, including civil society and judiciary, must play an active role to strengthen the democratic spirit," he added.
"I don't want to blame anyone. I am only worried about democracy," the Prime Minister said.
At least 10 people were killed and more than 50 injured on Monday in violence during the West Bengal panchayat polls on May 14.
Earlier, Modi began his speech by condoling the death of more than a dozen persons after an under-construction flyover collapsed in his parliamentary constituency Varanasi on Tuesday.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)