1 / 3 Show Caption + Hide Caption – A cloud of chlorine gas moves among condemned shipping containers and vehicles that replicate urban structures and first-responder response. The vastness of ...

Two cylinders dropped on the rebel-held Syrian city of Saraqeb — sending nearly a dozen people to seek medical help for nausea and other symptoms — had contained chlorine, the OPCW says ...

Mysterious chemical byproduct in U.S. tap water finally identified. Scientists discover formula and structure of chlorine-related molecule and urge tests for possible toxicity.

Two cylinders dropped on the rebel-held Syrian city of Saraqeb — sending nearly a dozen people to seek medical help for nausea and other symptoms — had contained chlorine, the OPCW says.