Over saturation of the slope forming material resulting in pore water pressure due to heavy rainfall coupled with the steepness of the slope led to failure.
Tep, Y. and Kumar, A. (2018); MacroScale (1:50,000) Landslide Susceptibility Mapping in Toposheet nos. 83C/16 and 83H/1 in  Dima Hasao and Cachar districts in Asam and East Jaintia hills  District in  Meghalaya and West and Central MNipur district in MNi
Prompt action is required to remove the debris from the steep slope and construction of retaining wall as further failure is imminent during torrential rainfall.
Lalpani
NH53
Toe support for the affected slope through construction of strong RCC retaining wall with sufficient weep holes founded on sound substratum. Removal of the side debris from the slope face. Construction and proper maintenance of concrete road side drain.
Oversaturation of slope forming material and increase in local pore water pressure during torrential rainfall and anthropogenic activities (unplanned cutting of slope for road).