The Organisation for the Prohibition of Chemical Weapons, which won the Nobel Peace Prize last month, is overseeing the destruction of Syria’s nerve agent stocks under a U.S.-Russian agreement reached in September.

It has so far raised about 10 million euros ($13.5 million) for the task.

“It is the assessment of the Secretariat that its existing personnel resources are sufficient for operations to be conducted in October and November 2013,” said an October 25 OPCW document seen by Reuters. At the time, its account held just 4 million euros.

Syrian president Bashar al-Assad says the total cost could be $1 billion, although experts say it is likely to be lower, running into the tens or hundreds of millions of dollars, depending on where and how the chemical arms are destroyed.