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Rob Fields holds up the blood type of his wife, Laura, outside the packed United Blood Services in Midland after a parade float carrying wounded veterans and their families was struck by a train Thursday, Nov. 15, 2012, killing four and injuring 17, in Midland, Texas. Fields and his wife Laura traveled more than 30 miles from Lenorah, Texas after hearing on the television news that the United Blood Services was specifically in need of 0- type blood. (AP Photo/Reporter-Telegram, James Durbin)

Train crashes into vets' parade

Four people died and 17 others were taken to a hospital when a train

crashed into a parade float honoring veterans in Midland, Texas, late Nov. 15