The first group of inspectors are in Syria to oversee the destruction of the country's chemical weapons.
Fighting between government troops and al Qaeda-linked Jabhat al-Nusra fighters continued on the outskirts of Damascus Wednesday as inspectors left their hotel to being their work.
The Syrian Observatory for Human Rights said the latest round of fighting broke out Monday as the army fought the group trying to capture the district of Barzeh.
According to the report, 19 soldiers have been killed and dozens wounded in the fighting since Monday.
The international team must complete the task of locating, dismantling, and destroying the estimated 1,000-ton arsenal, and they have to do it before the middle of next year.
The Organization for the Prohibition of Chemical Weapons, composed of 14 U.N. staffers and 19 members of a chemical weapons watchdog group based in the Netherlands, is using secret routes to protect their safety and Syria's goal of keeping its military locations private.
Syria agreed to surrender its chemical weapons stockpile after President Barack Obama accepted a deal brokered by Russian President Vladimir Putin.