A senior administration official says there is "very little doubt" that a chemical weapon was used by the Syrian regime against civilians in an incident that killed at least a hundred people last week.
The official said Sunday that the U.S. intelligence community based its assessment given to the White House on "the reported number of victims, reported symptoms of those who were killed or injured, and witness accounts." The official spoke on condition of anonymity because the official was not authorized to speak publicly.
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The official says the White House believes the Syrian government is barring a U.N. investigative team immediate access to the site of a reported Aug. 21 chemical weapons attack in the Damascus suburbs in order to give the evidence of the attack time to degrade.
Syria warned the United States against any military action over a suspected chemical weapons attack in its civil war, saying it would "create a ball of fire that will inflame the Middle East," as the Obama administration moved naval forces closer to Syria.
President Bashar al-Assad's closest ally Iran also said Washington should not cross the "red line" on Syria, where doctors accused his forces of a poison gas attack that killed hundreds last week, Reuters reported.
A team of United Nations inspectors are waiting in a hotel in Damascus a few miles from the site of the attack, but Syria suggested they would not be allowed to visit as it was not on a list agreed in July of alleged chemical attacks this year.
Meeting on the issue Saturday with his national security team, President Barack Obama received a detailed review of the range of options he has requested for the U.S. and its international partners to respond if the fact-finding process concludes Assad engaged in deadly chemical warfare, the White House said.
At the same time, Obama has emphasized that quick intervention in the years-old Syrian civil war was problematic because of the international considerations that should precede a military strike.
Obama discussed the situation in Syria by telephone with British Prime Minister David Cameron, the White House said. It was Obama's first known conversation with a foreign leader about Syria since the reports this week that hundreds of Syrians had been killed by the alleged chemical attack in a suburb of Damascus.
The White House said the two leaders expressed "grave concern" about the reported chemical weapons use, which both of their countries oppose.
A statement from Cameron's office at No. 10 Downing St. said the prime minister and Obama are concerned by "increasing signs" that this was "a significant chemical weapons attack" by the Syrian government against its people. Obama and Cameron "reiterated that significant use of chemical weapons would merit a serious response from the international community," according to the statement.
Noting that the U.N. Security Council has called for investigators to be granted immediate access to the area, Cameron's office said, "The fact that President Assad has failed to co-operate with the U.N. suggests that the regime has something to hide."
To underscore the regional concern about spillover effects of the Syrian conflict, U.S. Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, is attending a meeting starting Sunday in Jordan with Mideast defense chiefs.
Pentagon press secretary George Little said the meeting, co-hosted by the U.S. Central Command, has been planned since June. But Syria is high on the agenda.
Officials have said Obama will decide how to respond once the facts are fully known.
"In coordination with international partners and mindful of the dozens of contemporaneous witness accounts and record of the symptoms of those killed, the U.S. intelligence community continues to gather facts to ascertain what occurred," the White House said after Obama's meeting, which included Secretary of State John Kerry, Defense Secretary Chuck Hagel and others.
Hagel declined Friday to discuss specific force movements while saying that Obama had asked the Pentagon to prepare military options for Syria. U.S. defense officials told The Associated Press that the Navy had sent a fourth warship armed with ballistic missiles into the eastern Mediterranean Sea but without immediate orders for any missile launch into Syria.
Navy ships are capable of a variety of military actions, including launching Tomahawk cruise missiles as they did against Libya in 2011 as part of an international action that led to the overthrow of the Libyan government.
"The Defense Department has a responsibility to provide the president with options for contingencies, and that requires positioning our forces, positioning our assets, to be able to carry out different options — whatever options the president might choose," Hagel told reporters traveling with him to Asia.
Hagel said the U.S. is coordinating with the international community to determine "what exactly did happen" near Damascus. According to reports, hundreds were killed in a chemical attack in a suburb. It would be the most heinous use of chemical weapons since Iraqi leader Saddam Hussein gassed thousands of Kurds in the town of Halabja in 1988.
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Hagel left little doubt that he thinks chemical weapons were used in Syria. "It appears to be what happened — use of chemical weapons," he said.
The United Nations disarmament chief, Angela Kane, arrived in Damascus on Saturday to press the Syrian government to allow U.N. experts to investigate the alleged chemical attacks.
Obama remained cautious about getting involved in a war that has killed more than 100,000 people and now includes Hezbollah and al-Qaida. He made no mention of the "red line" of chemical weapons use that he marked out for Assad a year ago, which U.S. intelligence says has been breached at least on a small scale several times since.
"If the U.S. goes in and attacks another country without a U.N. mandate and without clear evidence that can be presented, then there are questions in terms of whether international law supports it — do we have the coalition to make it work?" Obama said in a television interview broadcast Friday. "Those are considerations that we have to take into account."
Obama said in the interview with CNN's "New Day" that the episode is a "big event of grave concern" that requires American attention. He said any large-scale chemical weapons usage would affect "core national interests" of the U.S. and its allies. But nothing he said signaled a shift toward U.S. action.
For a year now, Obama has threatened to punish Assad's regime if it resorted to its chemical weapons arsenal, among the world's vastest, saying use or even deployment of such weapons of mass destruction constituted a "red line" for him. A U.S. intelligence assessment concluded in June that chemical weapons have been used in Syria's civil war, but Washington has taken no military action in response.
U.S. officials have instead focused on trying to organize a peace conference between the government and opposition. Obama has authorized weapons deliveries to rebel groups, but none are believed to have been sent so far.
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