3 of 10: A massive explosion at 3a.m. EDT on one of the two barges still ablaze in the Mobile River in Mobile, Ala., on Thursday, April 25, 2013. Three people were injured in the blast. Fire officials have pulled units back from fighting the fire due to the explosions and no immediate threat to lives. (AP Photo John David Mercer) (AP Photo/ John David Mercer)

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