A special representative of the U.N. secretary-general has told the Security Council that Syria has declared four chemical weapons facilities it had not mentioned before.

Diplomats say Sigrid Kaag told them Tuesday that three of the facilities are for research and development and one is for production, and that no new chemical agents have been associated with the four sites.

The U.S. ambassador to the U.N., Samantha Power, tweeted: “Must keep pressure on regime so it doesn’t hide CW capability.” […]