Fireworks light up the sky over the Philadelphia Museum of Art during an Independence Day celebration, Wednesday, July 4, 2012, in Philadelphia. (AP Photo/Matt Rourke)

Associated Press
Fireworks light up the sky over the Philadelphia Museum of Art during an Independence Day celebration, Wednesday, July 4, 2012, in Philadelphia. (AP Photo/Matt Rourke)
Fireworks light up the sky over the Philadelphia Museum of Art during an Independence Day celebration, Wednesday, July 4, 2012, in Philadelphia. (AP Photo/Matt Rourke)
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