China’s Henan province is bracing for more heavy rain after severe flooding that sparked large-scale evacuations left at least 33 dead. The death toll includes at least 12 commuters who were killed after water flooded subway carriages in the capital Zhengzhou. Eight people still remain missing, according to government figures with rain expected to continue.

Rainfall in the central Chinese province intensified since Tuesday, with Zhengzhou, a city of 10 million, receiving a year’s worth of rain in just three days. Across Henan, 3 million people have been affected and as many as 380,000 evacuated as of Thursday.

Dams and reservoirs swelled to warning levels and thousands of troops are taking part in the rescue effort. Roads were severely flooded in a dozen cities of the province.