The United States Department of Defense says they suspect Syrian President Bashar al-Assad used chemical weapons on a "small scale" in the country’s civil war, despite lacking solid evidence and having "varying degrees of confidence" in the allegations.

US Defense Secretary Chuck Hagel made the claim Thursday while speaking in Abu Dhabi, United Arab Emirates, adding that the American intelligence community has determined “with varying degrees of confidence that the Syrian regime has used chemical weapons on a small scale in Syria, specifically the chemical agent sarin."



US intelligence allegedly indicated that Syria had "twice" used chemical weapons, thereby crossing Obama's much quoted 'red line' for intervention. However, White House officials said on Thursday that the evidence isn't concrete enough to warrant such intervention, meaning it doesn't necessarily preempt an immediate change in the US level of involvement in the country.



Sarin is a colorless, odorless liquid which is used as a chemical weapon. The gas is an extremely potent nerve agent and has a lethal dose of 0.5 milligrams for an adult.



Even at very low concentrations, sarin can be fatal. Death may follow just one minute after direct ingestion of a lethal dose. Atropine and pralidoxime may be used as antidotes, but must be administered immediately.

Sarin, which is estimated to be over 500 times more toxic than cyanide, is classified as a weapon of mass destruction under UN Resolution 687. Production and stockpiling of sarin was outlawed by the Chemical Weapons Convention of 1993.

However, Hagel insisted that the use of chemical weapons by any army would violate international guidelines for armed conflicts, and said confirmation of these reports would be a “game changer ” in terms of America’s role in the Syrian civil war.

"It violates every convention of warfare,” said Hagel, the Associated Press reports.

The White House informed Congress about the use of chemical weapons during a Thursday briefing, continues the AP. White House legislative director Miguel Rodriguez sent a letter to Senators John McCain (R-Arizona) and Carl Levin (D-Michigan) explaining that "because the president takes this issue so seriously, we have an obligation to fully investigate any and all evidence of chemical weapons use within Syria."

"Thus far, we believe that the Assad regime maintains custody of these weapons, and has demonstrated a willingness to escalate its horrific use of violence against the Syrian people," Foreign Policy quotes from the letter.

Moments after news of the letter were first reported, Sen. McCain walked out of a briefing in Washington with Secretary of State John Kerry and told reporters, "We just received a letter from the president in response to our question about whether Assad had used chemical weapons.”





Kerry, reports the AP, said the Syrian regime launched two chemical weapons attacks during that Thursday morning meeting, which Foreign Policy says was attended by reportedly all US senators, as well as representatives for the office of the director of national intelligence and the Federal Bureau of Investigation.

Speaking to CNN shortly later, Sen. McCain said he’s not surprised by the latest intelligence report and has long assumed that Assad’s regime was engaged in chemical warfare. Of specific concern to him, however, was what could happen if the alleged warheads end up in the arsenals of others.

“I think they have control over them at the moment,” he said of the weapons, “but some of them are in heavily contested areas and could easily fall into the hands of jihadist extremists.”

“We need to have operational capability to secure these weapons,” added McCain.

The United Nations and the Secretary General have been notified about alleged chemical weapons use in Syria by American politicians. In response, a spokesman for the UN chief warned that “the United Nations is not in a position to comment on assessments based on national intelligence information.”

But a team of UN advisers “have been in contact with the US authorities on the latest developments,” the spokesperson for the Secretary-General said in a statement.

The statement added that a “technical expert team to conduct a fact-finding mission” has been put together and is on standby, ready to begin work in “24-48 hours.”

So far the expert team is still awaiting its marching orders, after UN chief Ban Ki-moon promised the probe in late March, following an official request by the Syrian authorities to appoint an independent mission to investigate the alleged chemical attack that claimed lives of at least 25 people on March 19.

Although following the Syrian plea, the United Nations said the team would not include experts from Russia and China to ensure it wasn’t biased. Russian EU envoy Vitaly Churkin criticized “this kind of logic” saying in that case he “would recommend excluding all NATO countries too.”

Following this development, in early April, Syria refused to let the UN proposed team enter Syria as it - contrary to the Syrian request - was planning to deploy “throughout Syrian territory” and not at particular locations of alleged attacks. “Syria cannot accept such manoeuvres on the part of the UN secretariat general, bearing in mind the negative role that it played in Iraq and which cleared the way for the American invasion,” a Syrian foreign ministry official explained at the time.

The official stressed that Syria had specifically asked for “a neutral and honest technical team to visit the village of Khan al-Assal” in the province of Aleppo.



US President Barack Obama said previously that the use of chemical weapons in Syria would be a "red line" that could trigger US reaction if crossed. On Thursday Rodriguez wrote on behalf of the administration that “physiological samples" has led the White House to reassess the claims that Assad has used chemical warfare. Christiane Amanpour, the chief international correspondent for CNN, said that sources have told her that physicians working with the Free Syrian Army obtained blood samples from chemical warfare victims and provided them to US intelligence along with soil samples collected from the earth.



Britain, France, Qatar and the Israel Defense Forces have also said in recent days that Israeli intelligence has led them to believe Assad has used chemical weapons.

Intelligence assessments on Syrian chemical weapons are “not enough,” Reuters quotes the White House, adding that “credit and corroborated facts” are needed.

Even one day earlier, Sec. Hagel himself had doubts about the rumored use of chemical weapons. Speaking in Cairo, Egypt on Wednesday, Hagel said that Israeli claims of Assad employing chemical warfare were “suspicious” and that “we have to be very careful here before we draw any conclusions based on real intelligence.”

“The use of chemical weapons in an environment like Syria is very difficult to confirm,” a senior US Defense official told the Los Angeles Times in response while speaking on condition of anonymity. “Given the stakes involved, low-confidence assessments by foreign governments cannot be the basis for US action.”



On Tuesday, a White House spokesperson told AP that although investigation was ongoing, they had not come to any full conclusions that there has been chemical weapon usage.

