Hopes of finding survivors began to fade as hundreds of rescuers worked through slush and rocks and pulled out bodies from debris in the hills of India's Kerala state on Wednesday, a day after at least 167 people were killed in monsoon landslides.

Steady rain that intensified as the day progressed and the rising water level in a local river hampered the rescue, with a temporary bridge built to connect the worst affected area of Mundakkai being washed away.

The weather department has forecast more heavy rain over the next 24 hours, Kerala's Chief Minister Pinarayi Vijayan said and urged people to be on "high alert."