Fourth of July fireworks light up skies across America

July 4, 2014: Fireworks explode over the Lincoln and Washington Monuments as Independence Day is celebrated in Washington. (Reuters)

July 4, 2014: Lower Manhattan is seen as the "Macy's 4th of July" fireworks explode over the East River in New York. (Reuters)

July 4, 2014: Fireworks explode over the Philadelphia Museum of Art during an Independence Day celebration in Philadelphia. (AP)

July 4, 2014: Fireworks explode over the Philadelphia Museum of Art during an Independence Day celebration in Philadelphia. (AP)

July 4, 2014: Lower Manhattan is seen as the "Macy's 4th of July" fireworks explode over the East River in New York. (Reuters)

July 4, 2014: Fireworks light up the sky above the Brooklyn Bridge during Macy's Fourth of July fireworks show in New York (AP)

July 4, 2014: This aerial photo shows a Fourth of July fireworks celebration over the Mississippi River in New Orleans. (AP)

July 4, 2014: Fireworks explode on the National Mall in Washington during Fourth of July celebrations. (AP)

July 4, 2014: Fireworks explode on the Brooklyn Bridge during the Macy's Fourth of July show. (AP)