"Seven people have been killed and 90 other injured in and around the Mela area," Ujjain Divisional Commissioner Ravindra Pastaur told PTI.The second 'Shahi Snan' (royal bath) is slated for May 9.
Prima facie, the casualties resulted due to collapse of tents and some gates erected at the Kumbh area.
Among the deceased is a woman pilgrim who was killed in Undasa area when lightning struck her.
It will take at least a week to erect them again, he said.
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Authorities fear that the death toll may rise as the rescuers are clearing the collapsed tents and pulling out the people trapped under them.
Terming the incident as painful, Madhya Pradesh Chief Minister Shivraj Singh Chouhan has announced an ex-gratia of Rs. 2 lakh each to the kin of the deceased persons and Rs 50,000 to seriously injured and Rs 25,000 to the minor injured, an official spokesman said.
He tweeted that rescue teams, officials and public representatives have reached the spot and that they will take care of the pilgrims.
The rain made large parts of the Mela ground slushy, making the rescue operation difficult. Authorities have cut off the electricity supply to the area as a precautionary measure.
The deceased have been identified as Rumal Kaur, Amba Bai, Prahlad, Bhagirath, Rishi Prasad and Bhuti Bai, District Hospital Police Post Head Constable Babulal said.
However, the identity of the woman pilgrim who was killed in Undasa area is not established yet.
The state government has spent more than Rs 3,600 crore for developing infrastructure and facilities for the month-long congregation.