Syria has surrendered or destroyed nearly a third of its chemical arsenal but remains behind on its international obligations, the head of the disarmament mission told the world’s chemical watchdog Tuesday.

Syria has surrendered or destroyed nearly a third of its chemical arsenal but remains behind on its international obligations, the head of the disarmament mission told the world's chemical watchdog Tuesday.

Syria has already missed several target dates to hand over or destroy its arsenal before a June 30 deadline and the United Nations-Organization for the Prohibition of Chemical Weapons (OPCW) mission called on Damascus to move faster.

"Nearly one third of Syria's chemical weapons material has now been removed or destroyed," UN-OPCW coordinator Sigrid Kaag told a meeting of the watchdog at its Hague headquarters.

"This is good progress and I expect further acceleration and intensification of effort."

OPCW head Ahmet Uzumcu told the Executive Council meeting that Syria had submitted a revised proposal to complete the removal of all chemicals from Syria before the end of April, after previously saying it could only complete the job by June.

An OPCW meeting two weeks ago heard that just 11 percent of Syria's dangerous chemicals had left the country.

But with two shipments last week and one more expected this week, the country will have handed over more than 35 percent of its arsenal, Uzumcu said.

"Given delays since the lapse of the two target dates for removal, it will be important to maintain this newly created momentum," Uzumcu said.