Honor guard stand in front of caskets prior to a memorial service for first responders who died in last week's fertilizer plant explosion in West, Texas, Thursday, April 25, 2013, in Waco, Texas. President Barack Obama, U.S. Sen. John Cornyn and Texas Gov. Rick Perry are set to speak at Thursday's memorial at Baylor University's Ferrell Center in Waco. Firefighters and other first responders were among those killed when a fire at the plant erupted in an explosion last week. Hundreds of people were injured. (AP Photo/Eric Gay)

Associated Press
Honor guard stand in front of caskets prior to a memorial service for first responders who died in last week's fertilizer plant explosion in West, Texas, Thursday, April 25, 2013, in Waco, Texas.  President Barack Obama, U.S. Sen. John Cornyn and Texas Gov. Rick Perry are set to speak at Thursday's memorial at Baylor University's Ferrell Center in Waco. Firefighters and other first responders were among those killed when a fire at the plant erupted in an explosion last week. Hundreds of people were injured.  (AP Photo/Eric Gay)
Honor guard stand in front of caskets prior to a memorial service for first responders who died in last week's fertilizer plant explosion in West, Texas, Thursday, April 25, 2013, in Waco, Texas. President Barack Obama, U.S. Sen. John Cornyn and Texas Gov. Rick Perry are set to speak at Thursday's memorial at Baylor University's Ferrell Center in Waco. Firefighters and other first responders were among those killed when a fire at the plant erupted in an explosion last week. Hundreds of people were injured. (AP Photo/Eric Gay)
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