River laden with huge sedimentary load caused toe cutting and this accentuated with development of pore pressure and reduction in shear strength due to heavy rainfall led to the landslide 

An interim report on Preliminary slope stability assessment of recent disaster affected areas of Pithoragarh District, Uttarakhand by A Bishwapriya, Suptg. Geologist, M V Dhakate and P K Gajbaiye, Sr Geologist, M IV, NR,Dehradun (LHZ/NR/UPUK/2013/056)
High risk to existing settlements. Shifting of the river channel from right to left bank
UK/Pith/ Munsyari-Jauljibi/Vil/BE/0038
Lumti(Talla) village
Flood protection wall, dredging of the river silt.
Presence of loose and unconsolidated material, flooding of the river with high current and toe erosion in soil. Also the development of the pore pressure and reduction of the shear strength of the material due to saturation by water percolation, gully er