The number, far higher than any previous estimate, poses a test for the new government. Experts fear that sarin, chlorine and mustard gas stockpiles could be unsecured.
Investigating a possible chemical weapons attack site in the Ain Tarma area of Syria in 2013. When president, Bashar al-Assad used chemical weapons during the yearslong civil war.
A group of Jews who left Syria decades ago wants sanctions relief for a government with former ties to Al Qaeda, despite wariness from other Jewish groups and from Israel.
Henry Hamra, a Syrian Jew, in a meeting with lawmakers in Washington on Tuesday. Mr. Hamra is working with Syrian American advocacy groups in lobbying the United States to lift sanctions.