President Barack Obama attends the memorial for firefighters killed at the fertilizer plant explosion in West, Texas, at Baylor University in Waco, Texas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

Associated Press
President Barack Obama attends the memorial for firefighters killed at the fertilizer plant explosion in West, Texas, at Baylor University in Waco, Texas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)
President Barack Obama attends the memorial for firefighters killed at the fertilizer plant explosion in West, Texas, at Baylor University in Waco, Texas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)
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