Immigration enforcement officers are making 7-Eleven stores a target in their crackdown on employers who hire undocumented immigrants. On Wednesday, agents with U.S. Immigration and Customs Enforcement descended on 98 7-Eleven franchise stores across the country, where they began audits and interviewed employees and managers, according to the agency. Twenty one people suspected of being in the United States illegally were arrested. Officers targeted 7-Eleven stores in Washington, D.C., and 17 states including Nevada. No details yet on any local arrests.