Crackdown under way as part of an investigation into human smuggling . Authorities made Hundreds arrests on Thursday , Immigration and Customs Enforcement officials said . ( CNN ) -- Immigrants were shuttled in vans from the border to Phoenix and Tucson , officials said .
Crackdown under way as part of an investigation into human smuggling . Authorities made Hundreds arrests on Thursday , Immigration and Customs Enforcement officials said . Immigrants were shuttled in vans from the border to Phoenix and Tucson , officials said .