Homeland Security Secretary Jeh Johnson on Wednesday announced it has dismantled a human smuggling network that was used to illegally bring hundreds of people from Central America across the southern U.S. border.

Officials worked with officials in El Salvador, Guatemala and Mexico on “Operation Lucero,” which ended with the arrest of 36 people. DHS said the sting shut down 14 smuggling routes, and that officials executed 56 search warrants in the three countries.