A tropical storm has slammed into northeastern China, threatening a chemical plant.

High waves caused by tropical storm Muifa breached a dyke Monday morning at the Fujiahua chemical plant in the city of Dalian. Residents in the area were evacuated as a precautionary measure, while soldiers and workers reinforced the dyke with large stones and concrete blocks.

Chinese media said the breach was under control for the time being.

Muifa has swept up the Chinese coast and also threatens South Korea, where it left four people dead and two missing on Monday.