(CNN) Severe flooding in the southern Indian state of Kerala has killed at least 80 people in the past week, and more heavy rain is forecast in coming days.

State Relief Commissioner P.H. Kurian said the biggest loss of life came Thursday when 10 people died in a landslide.

Boats have been deployed across the state to reach thousands of people stranded by floodwater, and fishermen had been asked to help with rescue efforts, he said.

Officials announced the entire state was subject to a red alert Wednesday, the highest level, indicating the extent of the disaster which has forced tens of thousands of people to seek shelter in relief camps.

Railway and road transport has been all but halted with railway tracks and roads submerged under water. Operations at the international airport in the city of Kochi have been suspended until Saturday due to flooding.

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