The US President tweeted that the air strikes would be coming "nice and new and smart".
The U.N. agency demanded that it be given the "immediate, unhindered" ability to meet with people injured in the attack.
He said relations with Russia were now worse than during the Cold War. The report said no high-value Russian assets like ships or planes were in the crosshairs.
A former officer in Syria's chemical program, Adulsalam Abdulrazek, said Saturday the joint U.S., British, and French strikes hit "parts of but not the heart" of the program. "We don't participate in Twitter diplomacy". "We support serious approaches".
"We should all be outraged at these horrific reports and images from Douma", said Dr. Peter Salama, WHO's director general. Write to us in the Comments section, and visit our Facebook page.
The Syrian government has denied responsibility for the alleged chemical weapons attack on Saturday on the town of Douma where rebels have been holding out against a prolonged siege by pro-Assad forces.
Russia and Iran called the use of force by the United States and its allies a "military crime" and "act of aggression".
U.S. President Donald Trump has issued a warning to Russia.
Larnaca Cyprus is located under 200 miles from Damascus Syria
"More than 70 people sheltering in basements have reportedly died, with 43 of those deaths related to symptoms consistent with exposure to highly toxic chemicals", it said in statement.
Trump canceled a trip to Latin America to focus on the Syria incident, the White House said.
Mr Macron indicted any potential air strike would target Syria's chemical weapon supplies. That meant airstrikes, possibly in tandem with France and other allies that have expressed outrage at the alleged Syrian chemical attack, could be launched within hours of a presidential decision.
The sources did not know what happened to the samples after they reached Turkey.
An unidentified volunteer holds an oxygen mask over a child's face at a hospital fin Douma.
Earlier in the week, Russian Deputy Foreign Minister Mikhail Bogdanov said there was no threat of the situation in Syria spiraling into U.S. -Russian hostilities.
"Until we have a more long-term strategy, until we have some idea where we're going in Syria and the Middle East, it seems unwise, to me, to start launching missiles", said Smith, D-Wash.
Russian leader Vladimir Putin reaffirmed the Kremlin's skepticism about the allies' Douma claim, saying Russian military experts had found no trace of the attack.
And while it can rule on whether chemical weapons were used, it has no authority to declare who deployed them. What happens next, she said, is up to Assad and to his Russian and Iranian allies.