More than 70 migrants were found in six houses in Washington, D.C., operated by human smugglers, according to documents by Immigration and Customs Enforcement’s Homeland Security Investigations. Immigration officials discovered the migrants, 60 adults and 13 children, in six residential homes located in northwest Washington after conducting an operation that sought to uncover so-called “stash houses” in the area, according to the report obtained by NBC News. Stash houses are buildings in which human smugglers keep migrants in cramped quarters, typically without running water or air conditioning. Migrants are usually not able to leave the houses unless given permission by...