Chemical weapons inspectors in Syria say they have completed nearly half of their work in the country.
A spokesman for the Organisation for the Prohibition of Chemical weapons (OPCW) said the team was making good progress in its mission to inspect more than 20 sites.
However he said security remained a concern for the 60 inspectors - who have been in Syria since 1 October.
"A few" sites remained inaccessible to the team for security reasons, he said.
The OPCW's mission to rid Syria of chemical weapons was set up by a UN resolution.
It followed international outrage at a chemical weapons attack near the Syrian capital Damascus in August.
The organisation's work in Syria marks the first time the international chemical weapons watchdog - which won this year's Nobel Peace Prize - has been asked to oversee the destruction of a weapons armoury during a conflict.