The ministry asked the pilgrims to get properly acclimatised and spend at least three nights at 9,000 feet, and two nights each at 12,000 and 15,000 feet.

'Tourists may ensure that the tour schedule drawn up by their private tour operators have sufficient time for acclimatisation,' said the advisory.

Besides, they were also advised to take 19 medical steps to determine if they were healthy enough to take the arduous journey.

The ministry itself operates a subsidised tour for pilgrims, but seats are restricted and allotted by a draw.

Consequently, a large number of people go on expensive and poorly-equipped trips organised by private operators, often without any preparation for the rigorous journey.