Despite President Donald Trump mulling military options following the alleged chemical attack in Syria, Reuters reports that the U.S. government has not yet officially confirmed leader Bashar al-Assad is responsible for the incident.

Reuters reports:

The initial assessment of the U.S. government suggests that a nerve agent was used in the weekend chemical attack in Douma, Syria, but further evidence is needed to determine what specific agent was used, U.S. government sources said on Monday. The sources also said the U.S. government had not yet conclusively determined whether the attack was carried out by President Bashar al-Assad’s Syrian government forces.

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U.S. Ambassador to the United Nations Nikki Haley told the UN Security Council that the Trump administration would respond to the attack regardless of how the United Nationals voted.

“History will record this as the moment when the Security Council either discharged its duty or demonstrated its utter and complete failure to protect the people of Syria. Either way, the United States will respond.”

“I could hold up pictures of babies lying dead next to their mothers, in their diapers, all lying together, dead, ashen blue, open eyed and lifeless, white foam bubbling from their mouths and noses,” Haley added.

Earlier today, Trump warned Syria may pay a price for the alleged attack.

“We are studying that situation extremely closely. We are meeting with our military and everyone else that will be making some major decisions over the next 24 to 48 hours,” Trump told reporters.