Investigators began searching an area on County Road 116B in Knights Landing on Monday in connection with the 2016 disappearances of Yolo County teens Elijah Moore and Enirque Rios.
The search comes on the heels of four arrests made in connection to the missing persons cases.
On Friday, 21-year-old Chandale Shannon of Winters and 18-year-old Jesus Campos of Woodland were arrested on murder and conspiracy charges. Campos also had kidnapping charges brought against him.
Jonathan Froste, 21, of Knights Landing, was arrested Saturday on charges of murder and kidnapping.
David Froste was arrested on Monday on similar charges, according to a criminal complaint released Monday.
The teens' disappearances are still being handled as missing persons cases and no evidence has been found yet in the Knights Landing search.