City officials say a change in wind direction blew residual tear gas from a nearby police training center into a municipal building and caused minor irritation to several ...

Portland Mayor Ted Wheeler on Thursday ordered the Police Bureau to halt the use of CS gas as a crowd control tool amid ongoing protests that have routinely gotten out of hand. The directive comes ...

As the Trump administration continues to defend firing tear gas into crowds of asylum seekers, we look at the history of tear gas, which is banned in warfare but legal for federal authorities and ...