Millions of Hindu pilgrims are gathering in the northern Indian city of Allahabad for the religious festival of Kumbh Mela.

Held once every 12 years, it is believed to be the largest gathering of Hindus in the world.

Worshippers believe that bathing in the River Ganges during this time will absolve them from sin.

Al Jazeera's Sohail Rahman reports from Allahabad.