A suspected chemical weapons attack by Syrian forces on the rebel-held town of Douma has led to threats of U.S. intervention from President Trump, who in a tweet Wednesday called Syrian President Bashar al-Assad a “Gas Killing Animal who kills his people and enjoys it!”

The Syrian government and its Russian partners deny that chemical weapons were used or that Syrian forces carried out the attack, which occurred Saturday night and is reported to have killed at least 43 people. Read more.