Continuous heavy rainfall over the past three days has triggered a massive landslide in Tamenglong district of Manipur, completely blocking National Highway-37 (Imphal-Silchar via Jiribam road) at the Nungdalal area between K. Sinam and Nungnang villages, officials said on Friday. The landslide, estimated to span about 30 meters, occurred around 7 am and left more than 200 vehicles stranded.