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 were killed and over 30 have been injured in a stampede at the Maha Kumbh Mela, one of the world's biggest gatherings that occurs every 12 years.

The Hindu festival that turned deadly in northern India on Wednesday is a religious gathering with deep spiritual meaning for devotees who come by the millions to take a cleansing dip in waters they consider sacred.