``I've been urging people not to declare victory when the last chemicals leave the country. We cannot do that,'' said Rose Gottemoeller, the undersecretary of state for arms control and international security.

She said during a meeting with reporters that Syria must also destroy facilities, including hangars and tunnels, associated with its program.

She said there are unresolved ``omissions'' in the Syrian government's declaration of its chemical stockpile. She said those alleged discrepancies are being pursued by the Organization for the Prohibition of Chemical Weapons, which monitors implementation of the Chemical Weapons Convention.

Syria ratified the convention last year as part of the deal to eliminate its chemical weapons.

There also is an investigation into reports of alleged chlorine gas use in some Syrian towns, causing deaths and injuries.

Gottemoeller said Syria has moved about 92 percent of its chemical weapons stocks to port for shipment out of the country. She said the rest are at a single site near Damascus.

The head of the United Nations mission charged with destroying Syria's chemical weapons said Thursday the last 16 containers of chemical agents are in a contested area that is currently inaccessible due to the fighting.

NJF/NJF