The head of the world’s chemical weapons watchdog said Wednesday that the manner according to which the Syrian chemical weapons will be dismantled has not been set yet.

The head of the world's chemical weapons watchdog said Wednesday that the manner according to which the Syrian chemical weapons will be dismantled has not been set yet.

"This will be clarified when the chemical experts visit all the Syrian facilities that manufacture and preserve the chemical weapons," Organization for the Prohibition of Chemical Weapons chief Ahmet Uzumcu told journalists in The Hague.

The experts have already visited one chemical site in Syria and are visiting another on Wednesday.

"There are 20 sites to be visited in the coming weeks," Uzumcu stated.

Uzumcu asserted that watchdog has not identified the exact costs of the dismantling process.

Uzumcu said during a rare public briefing on the state of Syria's disarmament that the timeline "is extremely tight".

He denied however that the deadlines, including dismantling of all production facilities by mid 2014, were unrealistic.

"The cooperation with Syria has been quite constructive. The Syrian authorities are cooperative," Uzumcu pointed out.