U.S. President Barack Obama has announced a "red line" use of chemical weapons in Syria, U.S. officials suggested on Tuesday, Washington will not respond to such use is no clear evidence - evidence that may be very hard to come by.
Israel's military intelligence analysts said Tuesday in Tel Aviv, the Syrian government forces used chemical weapons - may be the nerve gas sarin - they try to force President Bashar al-Assad's anti-government armed combat.
He cited photographic evidence of the victims foaming at the mouth, the signing of their students.
Israeli allegations in the Middle East a week-long visit, the Secretary of Defense Chuck Hagel, follow a similar use of chemical weapons by the United Kingdom and France expressed concern.
But so far, these assessments lack of concrete evidence, Washington will need to accept a deeper U.S. involvement in the civil war in Syria, Obama has resisted. In turn, this caused the president of the "red line" is well-defined.
White House spokesman Jay Carney told reporters that take a cautious approach, made it clear that Washington is the Israeli allegations are serious, but need to "conclusive evidence", and then decide whether to move forward.
"We have not been using conclusion," Carney said. "But it's something we are very concerned about our partners, and, obviously, can not be accepted, because the president is clearly stated."
A senior U.S. defense official speaking on condition of anonymity, said: "low confidence" can not be assessed on the basis of the action of the United States by a foreign government.
Officials seem to play down the extent of any evidence of chemical weapons used by the British and French diplomats in the March 21 letter to the office of the United Nations Secretary-General Ban Ki-moon. Obama administration officials pointed out that it is based on the source of second-hand and third-party information.
"The letter did not provide conclusive evidence of the use of chemical weapons, but did not ask the United Nations to investigate all allegations of use in Syria," Defense Ministry officials said.
An expert team of the United Nations, from going to Syria to survey controversial visit to Damascus government claims, because blocked.
Memories of Iraq
Report of visit to Israel last month, Obama said the Syrian government possible use of chemical weapons, "Once we have established the fact, I have already made clear use of chemical weapons is a change in the rules of the game."
Obama administration's determination to avoid the commission itself is not airtight proof, coupled with international support, in part because the lessons of the Iraq war, a person familiar with the matter, said recently that the White House decision-making.
Then, the Bush administration is using the wrong intelligence, the pursuit of the reasons for the invasion of Iraq, even non-existent nuclear weapons, chemical weapons and biological weapons.
"Will not rush to judgment," the source said.
U.S. officials and experts cited the United States confirmed the difficulty of use of chemical weapons in Syria.
For example, officials have said they are reluctant to give much credibility the alleged use of chemical weapons issued from the Syrian opposition, taking into account such claims suspect, because the vested interests of Washington's military intervention.
So far, the United States has limited itself to non-military support of the opposition. Last weekend, Secretary of State John Kerry of non-lethal assistance component destined to rebels announced a new package. Far apart, But what some members of the U.S. Congress, U.S. allies such as Britain, France and the Syrian opposition leaders seek.
If it is considered to have failed the implementation of Obama's chemical weapons ultimatum to Assad, who cling to power through even though the United States has repeatedly called for the resignation of Washington may face further criticism.
Raymond Zilinskas, a chemical and biological weapons expert at the Monterey Institute's James Martin Center for Nonproliferation Studies, cited Israeli officials say the photographic evidence - the victim foaming at the mouth - symptoms consistent use of a nerve agent such as sand Lin gas.
But he questioned the photographic evidence can prove that the use of chemical weapons alone.
"The difficult part is - you really need is a sample, said:" Zilinskas.
Sarin or other nerve agents hovering over a period of time in the blood and tissue samples, hair samples may be longer, he said. "It's almost like a smoking gun."
It does not know, perhaps with the assistance of the Syrian rebels, Western intelligence agencies have prompted biological or soil samples from the site suspected of attacks last month.
Chemical weapons evidence standard of proof in accordance with Washington, the U.S. action may further delay, intelligence analysts trying to figure out how it is widely - a factor that will determine the extent of any U.S. response.
Although the emergency plan has been crafted, U.S. officials continue grappling with issues such as whether the U.S. military will be able to find sufficient reserves of Assad and whether the material can be "safe, which guards Syria civil war, or whether it To remove the.
Another wild card is how Israel might respond. Carney refused to answer questions, the White House has realized that Israel will go to public accusations (Tuesday), whether it is prudent to do so.
The source close to the White House decision-making speculated that Israel may have disclosed the results of its investigation, send a message to the military Assad Syria chemical weapons stockpiles in its sights, and will not hesitate to take action, if deemed necessary, to ensure that it.
 



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