WASHINGTON - The White House said on Wednesday that the "window is closing" to find a peaceful solution to the violence in Syria and added it did not know the whereabouts of Syrian President Bashar Assad after a deadly blast killed three of his top military officials.

"The window is closing, we need to take action in a unified way to help bring about the transition that the Syrian people so deserve," White House spokesman Jay Carney said at a news conference.

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