Five people have been arrested for running an “alien smuggling operation” in Phoenix, federal authorities said.

Rigoberto Rangel-Mora, 40, of Mexico, Jesus Marin-Esquivel, 52, of Mexico, Ingrid Bolanos-Gomez, 41, of Guatemala, Alejandro Ambrocio-Espinosa, 32, of Mexico, and Enrique Cervantes-Barrera, 48, of Mexico, were indicted by a federal grand jury earlier this month for conspiracy to transport and harbor illegal aliens based on their participation in the smuggling operation, according to a release from the U.S. Attorney’s Office, Arizona district.

The suspects were arrested following an investigation led by agents with U.S. Customs and Border Protection’s U.S. Border Patrol Intelligence Unit and Homeland Security Investigations.