PRAYAGRAJ, India — At least 30 people were killed and many more injured in a stampede at the world’s largest religious gathering early Wednesday, police said, as millions of pilgrims rushed to dip in sacred waters during the Maha Kumbh festival in northern India.

At least 17 people were killed and many more injured in a stampede at the Maha Kumbh festival in northern India early Wednesday, a doctor at a government hospital said, as tens of thousands of pilgrims rushed to dip in sacred river waters during the Hindu event.

It was not immediately clear what triggered the panic at the festival where devotees from across India had congregated to bathe at the confluence of the Ganges, the Yamuna and the mythical Saraswati rivers.

Some of the largest casualties caused by stampedes at religious congregations over the recent years include the deadly stampede that occurred last year on July 2 during a 'satsang' by self-styled godman, Bhole Baba, in Hathras, Uttar Pradesh, which claimed 121 lives, most of whom were women.

Indian authorities took more than 16 hours to release casualty figures, even as Prime Minister Narendra Modi acknowledged the loss of lives, calling the incident “extremely sad” and extending his condolences.

Millions of Hindus are gathering in a northern Indian city for the Maha Kumbh festival, the world’s largest religious congregation

A senior police officer said at least 30 people died as a crowd panicked at the Hindu Kumbh Mela mega-festival in the northern city of Prayagraj.

At least 30 people have been killed in a crush at the world's largest religious gathering, the Hindu festival Kumbh Mela in northern India, officials say. The incident took place