U.S. President Donald Trump on Monday promised quick, forceful action in response to a suspected chemical weapons attack in Syria, appearing to suggest a potential military response.

Speaking at a meeting with military leaders and national security advisers, Trump said he would make a decision by Monday night “or very shortly thereafter” on a response, adding that the attack “will be met forcefully”.

“We are here to discuss Syria. We’re the greatest fighting force anywhere in the world. And 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,” he said.

The suspected chemical weapons attack late on Saturday killed at least 60 people, with more than 1,000 injured in several sites in Douma, a city near the capital, Damascus, according to a Syrian aid organization.