Multiple people were killed in a crowd crush at the world’s largest religious gathering in India early Wednesday, as tens of millions of devotees went to bathe in a river on one of the most sacred days of a Hindu festival.

Dozens of worshippers are feared dead and many more injured following a stampede or crush Wednesday at the massive Kumbh Mela religious festival in northern India, according to officials.

What caused the stampede at the Maha Kumbh mela in the early hours of Wednesday? What is the situation now? Here's what we know, in 10 points.