The UN experts investigating last week's alleged chemical weapons strike outside Damascus left Syria early Saturday and crossed into neighboring Lebanon, departing hours after President Barack Obama said he is weighing "limited and narrow" action against a Syrian regime that the administration has bluntly accused of launching the deadly attack.
An Associated Press crew saw the UN personnel enter Lebanon from Syria through the Masnaa border crossing and then drive in a 13-car convoy to the Beirut airport. After four days of on-site inspections, the team wrapped up its investigation Friday into the suspected chemical attack on rebel-held suburbs of Damascus on Aug. 21.
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The experts take with them blood and urine samples from victims as well as soil samples from the affected areas for examination in laboratories in Europe. The United Nations has said it will try to expedite its final report, and UN disarmament chief Angela Kane is to brief Secretary-General Ban Ki-moon later Saturday on the investigation.
The inspectors' departure brings the looming confrontation between the US and President Bashar Assad's regime one step closer to coming to a head.
President Obama has said that if he opts for a military strike, any operation would be limited in scope and only aimed at punishing Assad for his alleged use of chemical weapons.
But US action carries the potential to trigger retaliation by the Syrian regime or its proxies against U.S. allies in the region, such as Jordan, Turkey and Israel. That would inject a dangerous new dynamic into a Syrian civil war that has already killed more than 100,000 people, forced nearly 2 million to flee the country and inflamed sectarian tensions across the Middle East.
While Obama has long been wary of US military involvement in the conflict, the administration on Friday forcefully made its case for action against Syria in the wake of last week's events outside Damascus. It accused the Assad regime of carrying out what it says was a chemical attack on Aug. 21 that killed at least 1,429 people - far more than previous estimates - including more than 400 children.
With France as his only major public ally, Obama told reporters he has a strong preference for multilateral action.
"Frankly, part of the challenge we end up with here is a lot of people think something should be done but nobody wants to do it," he said.
Meanwhile, American defense officials said a sixth US warship is now operating in the eastern Mediterranean, near five US destroyers armed with cruise missiles that could soon be directed against Syria as part of a "limited, precise" strike.
They stressed that the USS San Antonio, an amphibious ship with several hundred US Marines on board, was in the region for a different reason and there were no plans to put Marines on the ground as part of any military action against Syria.
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One of the officials said the San Antonio's passage into the Mediterranean was long-planned, but officials thought it prudent to keep the ship in the eastern Mediterranean near the destroyers given the current situation.
"It's been kept there as a precaution," said one of the officials, who was not authorized to speak publicly.
The San Antonio transited through the Suez Canal on Thursday from the Red Sea, and received new orders on Friday to remain in the eastern Mediterranean, near the destroyers, according to defense officials. It is one of three ships that are carrying 2,200 Marines who have been on a six-month deployment in the region around the Arabian peninsula.
The Obama administration released evidence on Friday that it said demonstrated the Syrian government had used chemical weapons against civilians. It made clear on Friday that it would punish Syrian President Bashar Assad for the "brutal and flagrant" attack that it says killed more than 1,400 people in Damascus last week.
Officials cautioned the operation under discussion involved a limited, precise set of targets that would be of a short duration, unlike the broader campaign against Libya in March 2011.
The US Navy generally keeps three destroyers in the Mediterranean, but kept two additional destroyers there at the end of their deployments as the situation evolved in Syria over the past week.
The five destroyers are each carrying an estimated three dozen or more Tomahawk missiles for a combined total of about 200 missiles, according to defense officials.
Byron Callan, analyst with Capital Alpha Partners, projected that a limited Syrian strike would use about 200 to 300 Tomahawk missiles, compared to about 221 used in the Libya operation.
Defense officials said a more narrowly targeted operation against Syria could involve even less missiles.
They cited a debate within the Obama administration about striking the right balance between a limited cruise missile attack aimed at delivering a message about chemical weapons, and a broader attack that could be seen as a strong insertion of the United States into the Syrian civil war.
Military and civilian officials have expressed the need for caution to avert a cascading military conflict that could have repercussions throughout the region. Some officials have cautioned that even an attack on military helicopters could be seen as part of a US campaign to disable the Syrian military.
Retired Admiral Gary Roughead, who served as chief of naval operations during the 2011 strikes on Libya, said any strike on Syria would have to be targeted precisely to do the maximum amount of damage to Syrian military headquarters and other key sites - and to avert the possibility of retaliatory action.
"If you're going to try to shape events, you really need to hurt them," said Roughead, now a visiting fellow at Stanford University's Hoover Institution. "You would have to do something that would diminish the effectiveness of the Syrian military and that would be their command and control, perhaps their leadership, and then their ability to control air space."
AP, Reuters contributed to the report
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