According to Mohanty, floodwaters surged through Bhote Koshi River, causing widespread destruction in Timure in Rasuwa district and the nearby Syafrubesi area.
Maa Gambhiri, a coordinator with the group, said rescue operations were underway but authorities had yet to provide any information about the missing pilgrims.
On Thursday, Chief Minister C Joseph Vijay reviewed the ongoing steps taken for rescuing the Tamils stranded in Nepal and deputed four Ministers to New Delhi.
