A massive explosion at 3 a.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. (AP Photo John David Mercer)

Photo by: John David Mercer

A massive explosion at 3 a.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. (AP Photo John David Mercer)