India, Aug. 29 -- Anxiety is mounting for families in Mumbai as a 61-member Kailash Mansarovar pilgrimage group led by doctor-mountaineer Milind Chitley remains untraceable after the flash floods devastated the Nepal-Tibet border region.

The group, led by Dr Chitley and his wife Janhavi, had departed Mumbai on August 23 for Kathmandu and was last heard from on August 25 evening, hours before high-altitude torrents destroyed key immigration infrastructure on the morning of August 26.

Talking to PTI, Dr Chitley's brother-in-law Sandeep Padhye said, "We were in touch with my sister till August 25, but the messages sent on August 26 remain unread."

It is still unclear whether the group crossed into China before or during the floods, he sai...