President Barack Obama gestures as he speaks at a news conference in the Brady Press Briefing Room at the White House in Washington,Tuesday, April 30, 2013. The president said the US doesn't know how or when chemical weapons were used in Syria or who used them. (AP Photo/Charles Dharapak)

Associated Press
President Barack Obama gestures as he speaks at a news conference in the Brady Press Briefing Room at the White House in Washington,Tuesday, April 30, 2013. The president said the US doesn't know how or when chemical weapons were used in Syria or who used them. (AP Photo/Charles Dharapak)
President Barack Obama gestures as he speaks at a news conference in the Brady Press Briefing Room at the White House in Washington,Tuesday, April 30, 2013. The president said the US doesn't know how or when chemical weapons were used in Syria or who used them. (AP Photo/Charles Dharapak)
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