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

More than seven people were killed and around 10 injured in a stampede at the Maha Kumbh Mela in northern India on Wednesday, said an official, as tens of millions gathered to take a holy dip on the most auspicious day of the six-week Hindu festival.

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.