The Pentagon on Tuesday said the United States has seen chemical weapons activity at a Syrian air base used in past chemical attack.
The AP’s report comes after the White House issued a stern warning to Syrian President Bashar Assad Monday night claiming "potential" evidence that 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 U.S. had "identified potential preparations for another chemical weapons attack by the Assad regime that would likely result in the mass murder of civilians, including innocent children."
He said the activities were similar to preparations taken before an April 2017 attack that killed dozens of men, women and children, and warned that if "Mr. Assad conducts another mass murder attack using chemical weapons, he and his military will pay a heavy price."
The White House offered no details on what prompted the warning.
Syria has denied the White House’s allegations.