Police say at least 30 people were killed and many more injured in a stampede at the world's largest religious gathering as millions of pilgrims rushed to dip in sacred waters during the Maha Kumbh festival in northern India.

Hindu devotees and mystics have gathered in the northern Indian city of Prayagraj for the Maha Kumbh festival, which is the largest religious congregation on Earth.

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.

A Sadhu or Hindu holy men touches feet seek blessings from Shankaracharya of Jyotirmath Peeth of Uttarakhand, Swami Avimukteshwaranand Saraswati at Sangam, the confluence of rivers Ganges, Yamuna and

Millions continued to throng the site even as police urged them to avoid the area. Deadly stampedes are relatively common around Indian religious festivals, where large crowds gather in small areas.

People were trampled as pilgrims at the Maha Kumbh Mela, one of the world’s biggest gatherings, gathered where the Ganges and Yamuna Rivers meet.

Several people were feared dead after a stampede at the Maha Kumbh Mela, or Great Pitcher Festival, in northern India's Uttar Pradesh State on Wednesday, on one of the holiest days of the event as tens of millions of people gathered at the site.

A tragic stampede at the Maha Kumbh festival in northern India has left several people dead and many others injured.

Millions of Hindu pilgrims gathered in Prayagraj, India, for the Maha Kumbh Mela festival, but thousands were trampled after crowds surged toward the confluence of two rivers.