The United States on Wednesday called for closer monitoring of the long-delayed destruction of a dozen chemical weapons production facilities in Syria, which is several months behind schedule.

Damascus has handed over 1,300 metric tonnes of toxic chemicals but not yet destroyed a series of underground bunkers and hangars used to produce and store its deadly stockpile.

Syria joined the chemical weapons convention last year after a sarin gas attack on Aug. 21 killed hundreds of civilians in the Damascus suburb of Ghouta. President Bashar al-Assad’s government and rebel forces blamed each other for the strike. […]