President Barack Obama pauses as he answers questions during his new conference in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 30, 2013 in Washington. The president said the US doesn't know how chemical weapons were used in Syria or by whom. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama pauses as he answers questions during his new conference in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 30, 2013 in Washington. The president said the US doesn't know how chemical weapons were used in Syria or by whom. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama pauses as he answers questions during his new conference in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 30, 2013 in Washington. The president said the US doesn't know how chemical weapons were used in Syria or by whom. (AP Photo/Pablo Martinez Monsivais)
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