At least five people were killed by gunfire in election-related violence at two polling stations in India’s West Bengal state, police said Saturday.

Security forces caused the majority of the casualties — four killed and four wounded — while trying to control a crowd outside a voting center in Cooch Behar district, said senior police officer Vishal Garg. He gave no further details on what sparked the clashes.

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A paramilitary soldier stands guards as voters wait to cast their votes at a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

At least five people were killed by gunfire in election-related violence at two polling stations in India’s West Bengal state, police said Saturday.

Bani Dasgupta, 75, displays the indelible ink mark after casting the vote during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Local elections in West Bengal, one of the most populous Indian states, are being held in eight phases. Voting in four Indian states and a union territory began in late March and are spread over a month. Results will be declared May 2.

People stand in a queue to cast their votes at a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Modi's Bharatiya Janata Party has never won the state, and is banking on its strong Hindu nationalist ideology to draw votes.

Paramilitary soldiers keep vigil as voters enter a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Paramilitary soldiers keep vigil as voters enter a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

A paramilitary solder stands vigil as people stand in a queue to cast their votes outside a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

A paramilitary solder stands vigil as people stand in a queue to cast their votes outside a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Volunteers offer gloves and sanitizers to voters at the entrance of a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Volunteers offer gloves and sanitizers to voters at the entrance of a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)

In a separate incident, unidentified gunmen fired at voters at a polling station in the same district, killing one person. Garg said police were investigating the attack.

A paramilitary soldier stands guards as voters wait to cast their votes at a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

A paramilitary soldier stands guards as voters wait to cast their votes at a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Local elections in West Bengal, one of the most populous Indian states, are being held in eight phases. Voting in four Indian states and a union territory began in late March and are spread over a month. Results will be declared May 2.

The elections are seen as a crucial test for whether Prime Minister Narendra Modi’s party can gain a foothold in the northeast and south.

West Bengal is prone to election-related violence, and people have been killed during previous elections when supporters of rival political parties clashed with one other.

Bani Dasgupta, 75, displays the indelible ink mark after casting the vote during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Bani Dasgupta, 75, displays the indelible ink mark after casting the vote during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Modi's Bharatiya Janata Party has never won the state, and is banking on its strong Hindu nationalist ideology to draw votes.

He and his top leaders have campaigned heavily to wrest power from the state’s firebrand chief minister, Mamata Banerjee. A defeat for Banerjee, a strong Modi critic, would deal a blow to the country’s already weak opposition.

Modi’s overall popularity remains unmatched in India, but his party has faced tougher-than-expected challenges in recent state polls.

People stand in a queue to cast their votes at a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)

People stand in a queue to cast their votes at a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Paramilitary soldiers keep vigil as voters enter a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Paramilitary soldiers keep vigil as voters enter a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

A paramilitary solder stands vigil as people stand in a queue to cast their votes outside a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

A paramilitary solder stands vigil as people stand in a queue to cast their votes outside a polling station during the fourth phase of West Bengal state elections in Kolkata, India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Volunteers offer gloves and sanitizers to voters at the entrance of a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)

Volunteers offer gloves and sanitizers to voters at the entrance of a polling station during the fourth phase of West Bengal state elections in Kolkata , India, Saturday, April 10, 2021. (AP PhotoBikas Das)