Neither Dunford nor Mattis would confirm which USA platforms were used in the strike, but acknowledged a mix of systems - to include manned aircraft - were used for the "heavy strike".
Trump said the strikes were a "combined operation" with France and the United Kingdom and that the U.S.is "prepared to sustain this response" until the Syrian regime discontinues its use of chemical agents.
Syrian state TV said the army's air defences shot down 13 missiles.
Trump said a small American force over the past year has virtually eliminated Islamic State control over what once was a vast territory spanning parts of Syria and Iraq. "They have built a lot of flexibility into the plan to allow for further strikes based on what they've hit tonight". And the three allies are considering a joint military strike in retaliation.
U.S. officials said that ship-launched missiles and planes were involved in the attacks, and British officials said that missiles launched from GR4 Tornados warplanes had hit a plant near Homs believed to be used for precursors for making chemical weapons.
Mattis is now reported to be alone on the opposition to a USA military action in Syria during security meetings, as National Security Adviser John Bolton, acting Secretary of State John Sullivan, and United Nations envoy Nikki Haley have all voiced their support to strike the Assad regime.
The targets included a scientific research center located in the greater Damascus area.
Should the west initiate an attack on Syria, following allegations the Assad Regime was behind the poison attack in Douma over the weekend, you won't hear any complaints from Denmark.
On Wednesday he said the missiles were "coming", but on Thursday he tweeted that he had "never said when". "It has become, in the eyes of some combatants, a legitimate target", said Jason Cone of Doctors Without Borders in the documentary, "an incredibly important facet of where we define some sense of humanity amidst all this chaos is really getting eroded away".
"The evil and the despicable attack left mothers and fathers, infants and children, thrashing in pain and gasping for air", Trump said of the recent chemical attack.
Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellPompeo faces hard panel vote after grilling by Dems White House aims to send spending claw-back proposals by early May Paul Ryan's successor must embrace the House Freedom Caucus MORE (R-Ky.) said he supported both "the action and objective" of the strikes Friday. "They are the crimes of a monster instead". "We thank them both", Trump added.
Trump also put both Russian Federation and Iran on notice by calling both countries out by name during his short address.
"What kind of nation wants to be associate with the mass murder of innocent men, women and children?" he asked. "No nation can succeed in the long run by promoting rogue states, brutal tyrants, and murderous dictators", Trump said.
Following a sarin attack on Syrian civilians in the town of Khan Sheikhoun in April 2017, Trump ordered strikes on the Shayrat air base in Homs.
Dunford said he was not aware of a Russian response. Any further military action would depend on whether Syria keeps using chemical weapons, he said. "We are being threatened again".
Neither that strike, nor Friday's, was done with Congressional approval.
Britain and France have agreed to join a US-led campaign, but deliberations continue over the extent of strikes and targets.
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