At least four people have been arrested in connection with the deaths, a police official says.
Millions of pilgrims began bathing on the first official day of India's Kumbh Mela, billed as the world's largest religious festival where politics play an important role ahead of a general election later this year.
PM Modi's Hindu nationalist government, that spends millions for Hindus undertaking the Kailash Mansarovar and Kumbh Mela, is ending its policy of offering discounted airfares to Muslims embarking on the Hajj pilgrimage.
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