Crackdown under way as part of an investigation into human smuggling . Authorities made at least 40 arrests on Tuesday , border officials 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 . '' People were shuttled in vans from the border to Tucson and Phoenix , officials said .
Crackdown under way as part of an investigation into human smuggling . Authorities made at least 40 arrests on Tuesday , border officials said . People were shuttled in vans from the border to Tucson and Phoenix , officials said .