Syria's Assad will pay 'heavy price' for chemical attack, US warns

The White House has issued a warning to Bashar Assad as it claimed "potential" evidence showed Syria was preparing for another chemical weapons attack.

In an ominous statement, issued with no supporting evidence or further explanation, press secretary Sean Spicer said the US "has identified potential preparations" for another chemical attack by Bashar Assad's government that "would likely result in the mass murder of civilians, including innocent children".