People ride a front loader as they make their way through a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 22, 2021. Torrential rain continued to lash central China as officials raised the death toll to 33 people. REUTERS/Aly Song

People ride on a front loader as they make their way through a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. The fatalities include 12 people who were killed when the subway in the provincial capital of Zhengzhou, about 650 km (400 miles) southwest of Beijing, was flooded earlier this week. REUTERS/Aly Song

A man carrying a woman wades through floodwaters in front of a front loader following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. More than 73,000 people were being evacuated from the city of Anyang, on Henan's border with Hebei province, after being swamped by more than 600 mm of rainfall since Monday (July 19). REUTERS/Aly Song

A front loader carries people and water supplies through a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. REUTERS/Aly Song

People ride on a front loader as they make their way through a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. Picture taken with a drone. REUTERS/Aly Song

People ride on a front loader as they make their way through a flooded road following heavy rainfall in Zhengzhou, Henan province, China July 23, 2021. REUTERS/Aly Song