This is the second landfill that investigators have searched. They combed through a landfill in Brea last week, and they're now focusing their efforts on the Irvine landfill after learning that trash collected from the family's apartment in Orange was brought there.
Cadaver dogs are aiding the search for 2-year-old Fernando and 3-month-old Emmanuel.
The boys' father, Shazer Fernando Limas, has already been charged with the murders of the children, along with the murder of the boys' mother. Arlet Hernandez-Contreras' body was found in La Puente three weeks ago, but detectives say there was no sign of the boys.
Limas has been talking to police, but he has not given them the location of the bodies of the boys. Authorities say they're searching the Irvine landfill to exhaust all likely possibilities.
The area where the trash from the family's apartment was dumped has been identified. However, the search is a challenge because if the bodies were indeed brought there, they would have been brought there a month ago, around the time when the murders supposedly happened. In addition to the accumulation of garbage, the bodies of the young boys are very small and difficult to spot.
Search crews said they are planning on searching the landfill until at least Friday.