The chemical weapon inspectors have so far visited 19 of Syria's 23 disclosed chemical weapons' sites, the Organization for the Prohibition of the Chemical Weapons (OPCW) said on Friday, a day after its experts visited a chemical weapon site in an undisclosed location.

"The OPCW inspectors visited a site on Thursday and verified that all of its previous chemical weapon-related equipment has already been dismantled," the OPCW said.

"This brings to 19 the total number of sites visited by the OPCW inspectors, out of 23 that have been disclosed by Syria," it added.

In an earlier statement, the OPCW said that its teams were working with the Syrian authorities to prepare an initial declaration, which will include a general plan to destruct the country's chemical arsenal.

The OPCW noted that inspectors are currently working in three teams with "good access" to sites thus far, adding that state parties are providing the OPCW with lists of former inspectors who are available and willing to be deployed in the Syria mission going forward.