President Trump has threatened a forceful response to this weekend’s alleged chemical gas attack in Syria that killed at least 40 people and injured as many as 1,000 in the rebel-held town of Douma outside the capital, Damascus.

President Donald Trump: “We’re making a decision as to what we do with respect to the horrible attack that was made near Damascus. And it will be met, and it will be met forcefully. And when, I will not say, because I don’t like talking about timing. But we are developing the greatest force that we’ve ever had.”

Washington has blamed the Assad government for the chemical attack, but Russia claims there is no evidence an attack even took place.