The international chemicals watchdog is to investigate claims surrounding the alleged use of chlorine by the Syrian government against its citizens.
The mission, which is set to depart "soon", has been agreed to by the Syrian government, the Organisation for the Prohibition of Chemical Weapons said in a statement.
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Nearly 1,000 properties have been left without power, and road users have been warned of potentially hazardous conditions.
It follows a surprise summit between South Korea's Moon Jae-in and the North's Kim Jong-un.
Organisers issued a warning about a “dangerous high strength or bad batch substance on site”.