UNITED NATIONS (AP) — Syria has declared four chemical weapons facilities it hadn’t mentioned before, a special representative of the U.N. secretary-general told the Security Council on Tuesday. The news heightened concerns that the Syrian government hasn’t been fully open about its chemical weapons program.

Diplomats said Sigrid Kaag told them during closed consultations 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.