( CNN ) -- Hundreds of law-enforcement officers were making arrests and executing search warrants Thursday in Arizona as part of an investigation into human smuggling , the Immigration and Customs Enforcement agency said . Authorities made at least 40 arrests in an investigation into the suspected smuggling of illegal immigrants in vans that took them from the border to Tucson and Phoenix , two officials with Immigration and Customs Enforcement said . Federal authorities scheduled a news conference for Thursday afternoon to discuss what they called `` a massive , yearlong investigation targeting the infrastructure of several major Arizona-based human smuggling networks . ''
Crackdown under way as part of an investigation into human smuggling . Authorities made at least 40 arrests on Thursday , ICE officials said . Comment: