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.

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.

Officials had been preparing for months for the world’s largest religious festival, with around 400 million Hindu pilgrims expected to take part