(CNN) At least 324 people have died in the Indian state of Kerala since the start of monsoon season in late May, officials said Friday.

In just the past 10 days, flash floods and landslides have killed 164 people in the southern state, authorities said earlier Friday, as torrential monsoon rains continued to batter Kerala. Half of those deaths have occurred in the past three days, State Relief Commissioner P.H. Kurian told CNN.

The flooding is the worst Kerala has experienced in nearly a century.

The death toll has steadily risen over the past week as rescue workers scramble to reach thousands of people stranded by floodwater. The army, navy and coast guard have been sent in to assist, and fisherman have been asked to help with rescue efforts.

Thirteen of Kerala's 14 districts remain under a red alert, the highest warning level issued during emergencies in India, according to the country's National Disaster Response Force (NDRF), which has deployed 53 teams across the state.

A pregnant lady with water bag leaking has been airlifted and evacuated to Sanjivani. Doctor was lowered to assess the lady. Operation successful #OpMadad #KeralaFloodRelief #KeralaFloods2018 pic.twitter.com/bycGXEBV8q — SpokespersonNavy (@indiannavy) August 17, 2018

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