UNITED NATIONS/BEIRUT (Reuters) – U.S. officials rejected Russia’s assertion on Wednesday that Syrian rebels were to blame for a poison gas attack rather than President Bashar al-Assad, and signaled possible unilateral action over what Donald Trump called an “affront to humanity”.
The U.S. president said the attack, which killed at least 70 people, many of them children, “crossed a lot of lines”, an allusion to his predecessor Barack Obama’s threat to topple Assad with air strikes if he used such weapons.
It was not clear what, if any, action Trump would take.
The comments, which came just a few days after Washington said it was no longer focused on making Assad leave power, widened a rift between the Kremlin and Trump’s White House after initial signals of warmer ties.
Western countries, including the United States, blamed Assad’s armed forces for the worst chemical attack in Syria for more than four years.
U.S. intelligence officials, based on a preliminary assessment, said the deaths were most likely caused by sarin nerve gas dropped by Syrian aircraft on the town of Khan Sheikhoun on Tuesday. A senior state department official said Washington had not yet ascertained it was sarin.
Moscow offered an alternative explanation that would shield Assad: that the poison gas belonged to rebels and had leaked from an insurgent weapons depot hit by Syrian bombs.
A senior White House official, speaking on condition of anonymity, said the Russian explanation was not credible. “We don’t believe it,” the official said.
The United States, Britain and France have proposed a draft U.N. Security Council resolution that would condemn the attack; the Russian Foreign Ministry called it “unacceptable” and said it was based on “fake information”.
Kremlin spokesman Dmitry Peskov said Moscow would press its case blaming the rebels and deputy foreign minister Gennady Gatilov said Russia would veto the draft if Western nations went to a vote without further consultations, Interfax news agency reported.
Moscow has proposed its own draft, TASS news agency quoted a spokesman of Russia’s U.N. mission, Fyodor Strzhizhovsky, as saying on Wednesday.
The U.S. ambassador to the United Nations, Nikki Haley, issued what appeared to be a threat of unilateral action if Security Council members could not agree.
“When the United Nations consistently fails in its duty to act collectively, there are times in the life of states that we are compelled to take our own action,” she told the council, without elaborating.
Trump described the attack as “horrible” and “unspeakable”. Asked whether he was formulating a new policy toward Syria, he told reporters: “You’ll see.”
Video uploaded to social media showed civilians sprawled on the ground, some in convulsions, others lifeless. Rescue workers hose down the limp bodies of small children, trying to wash away chemicals. People wail and pound on the chests of victims.
The charity Medecins Sans Frontieres said one of its hospitals in Syria had treated patients “with symptoms – dilated pupils, muscle spasms, involuntary defecation – consistent with exposure to neuro-toxic agents such as sarin”. The World Health Organization also said the symptoms were consistent with exposure to a nerve agent.
“We’re talking about war crimes,” French U.N. Ambassador Francois Delattre told reporters in New York.
Hasan Haj Ali, commander of the Free Idlib Army rebel group, called the Russian statement blaming the rebels a “lie” and said rebels did not have the capability to produce nerve gas.
“Everyone saw the plane while it was bombing with gas,” he told Reuters from northwestern Syria. “Likewise, all the civilians in the area know that there are no military positions there, or places for the manufacture (of weapons).”
The incident is the first time U.S. intelligence officials have accused Assad of using sarin since 2013, when hundreds of people died in an attack on a Damascus suburb. At that time, Washington said Assad had crossed a “red line” set by then-President Obama.
Obama threatened an air campaign to topple Assad but called it off at the last minute when the Syrian leader agreed to give up his chemical arsenal under a deal brokered by Moscow, a decision which Trump has long said proved Obama’s weakness.