Howard declined to give any details about the flight path of the missiles, or the USA military assessment of the damage caused, but said she was confident the strikes had hit their intended target.

The United States warned Friday it is ready to hit Syria again after a missile strike that infuriated Moscow and fueled calls for a push to end the six-year war.

Following last week's events, Johnson canceled a long-planned meeting with Russian Foreign Minister Sergei Lavrov in Moscow, which had been scheduled for Sunday, to allow Tillerson to take the lead when he travels to the Russian capital later this week.

"In particular", he said, the response showed the Kremlin's "continued support for a regime that carries out these kinds of horrendous attacks on their own people".

US Ambassador Nikki Haley delivered the warning at an emergency session of the Security Council where Russian Federation accused the US of violating worldwide law and waging an "act of aggression" against Syria. Damascus has strongly denied carrying out the attack and says it does not use chemical weapons.

Nikki Haley, the USA ambassador to the United Nations, told an emergency meeting of the world body's Security Council that Washington had taken "a very measured step" but was ready to go further.

"If this intervention is limited only to an air base, if it does not continue and if we don't remove the regime from heading Syria, then this would remain a cosmetic intervention", said Cavusoglu in the southern city of Antalya. What of Trump's expressed willingness to deal with Russian Federation under Vladimir Putin?

"Those who commit war crimes should always be held accountable", he said.

"We do not have any information that suggests that Russian Federation was part of the military attack undertaken using the chemical weapons", Tillerson said.

Tillerson said he sees no reason for retaliation from Russian Federation for the US missile strikes.

In Florida with the president, Treasury Secretary Steven Mnuchin said additional economic sanctions on Syria were being prepared.

In Saudi Arabia, the official Saudi Press Agency reported that U.S. President Donald Trump has spoken by telephone with King Salman about the U.S. missile strike on Syria. Several U.S. warships in the Mediterranean Sea were ready to launch a missile attack but Obama suddenly pulled back after the Republican-controlled Congress and Britain, a key ally, resisted his plan.

"The United States attacked the territory of sovereign Syria", Russian Deputy Ambassador Vladimir Safronkov told the council, denouncing a "flagrant violation of worldwide law and an act of aggression". The drone returned late in the day as citizens were going to a nearby hospital for treatment.

The officials, who insisted on anonymity in order to discuss the sensitive matter, said they believe the hospital attack may have been an effort to cover up evidence of the earlier assault.

White House officials caution that Trump is not preparing to plunge the United States deeper into Syria.

The impact of the strikes was also unclear. Still, Haley said the USA didn't see a peaceful future for Syria with Assad in power.

Having to operate with constant concerns about potential collisions or other run-ins with Russian forces would complicate United States missions, says Nicholas Heras of the Center for New American Security. "It is in our vital national security interest to prevent the spread and use of chemical weapons".