More than 100,000 residents in West Virginia have been told not to use their tap water after a chemical leak contaminated the US state's water supply.
The chemical, 4 methylcyclohaxane methanol, which is used in the coal industry, entered the water supply through a local river. It can cause skin and eye irritation as well as headaches but is not extremely hazardous.
Nevertheless, hospitals are dealing with worried people and the FBI is conducting an investigation into the spill.
Al Jazeera's Alan Fisher reports.