(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."
When did authorities make arrests? What way were the immigrants transported to the border? What is being investigated? What is currently being smuggled? Whats the number of arrests? Where were the immigrants shuttled into? Roughly how many arrests were made on Thursday? Where were immigrants taken?
Thursday in vans human smuggling, illegal immigrants 40 vans at least 40 Tucson and Phoenix,
question: When did authorities make arrests?, answer: Thursday | question: What way were the immigrants transported to the border?, answer: in vans | question: What is being investigated?, answer: human smuggling, | question: What is currently being smuggled?, answer: illegal immigrants | question: Whats the number of arrests?, answer: 40 | question: Where were the immigrants shuttled into?, answer: vans | question: Roughly how many arrests were made on Thursday?, answer: at least 40 | question: Where were immigrants taken?, answer: Tucson and Phoenix,