Police investigate armed robbery at Independence 7-Eleven

<p>DES PLAINES, IL - MAY 9: A 7-Eleven store logo is visible outside a 7-Eleven store May 9, 2003 in Des Plaines, Illinois. Dallas, Texas-based 7-Eleven, Inc., the world's largest convenience store operator, reported on May 9, 2003 total sales for April 2003 of $897.0 million, an increase of 7.4 percent over the April 2002 total of $835.5 million, the 70th consecutive monthly increase in U.S. same-store sales. (Photo by Tim Boyle/Getty Images)</p>