Pablo Spencer / AFP - Getty Images
Paul J. Richards / AFP - Getty Images
People across the United States gathered on Thursday for parades, picnics and fireworks at Independence Day celebrations.
Ash spews from Mexico's Popocatepetl volcano, about 35 miles from Mexico City, as seen from San Mateo Ozolco, in the central state of Puebla, on July 4, 2013.
Four U.S. airlines temporarily suspended flights to and from Mexico City on Thursday after a volcano 50 miles from the capital spewed ash, a spokesman for the city's international airport said. Full story.