Chemical weapons

Hong Kong Health Official Claims Tear Gas Not Public Health Risk

Hong Kong's top health official has claimed that tear gas used by police on protesters poses no public health risk, days after police were reported to use the gas at a university campus. Some have expressed fears that the chemical weapon used in the city could contain the toxic pollutant dioxin.

US Ambassador: Chemical Weapon Attack Possible in US

U.S. ambassador to the United Nations Nikki Haley cautioned that chemical attacks similar to those in Syria "could happen" in the United States doesn't take more precautions domestically.