UNITED NATIONS — Secretary-General Antonio Guterres is again urging Syria to resolve "gaps, inconsistencies and discrepancies" in its declaration of chemical weapons after the global watchdog reported no progress on these outstanding issues.

The U.N. chief said in letter to the Security Council circulated Wednesday with the report from the Organization for the Prohibition of Chemical Weapons that he is "deeply concerned about the continued alleged use of toxic chemicals as weapons in the Syrian Arab Republic."

OPCW chief Fernando Arias said in the report that Syria's report still cannot be considered "accurate and complete" because of its failure to clear up "all of the identified gaps, inconsistencies and discrepancies."

He said OPCW investigators went to Syria in late September to investigate five alleged uses of chemical weapons in 2017.