CLEVELAND -- It's a joint investigation with the FBI, the Violent Fugitive Task Force, the Cleveland Police and the Cuyahoga County Prosecutor's office.
The FBI says it's the second such dig for the missing Amanda Berry since her disappearance nearly 10 years ago.
Excavators have been at it since 8 a.m. Thursday morning, carefully overturning the soil with hand shovels. They ended for the day and will resume searching again Friday morning.
They are sifting the earth and collecting whatever pieces might be relevant to Amanda Berry's disappearance.
The evidence is getting a whiff from police K-9 cadaver dogs trained to sniff out human remains.
Investigators are operating on a tip from prison inmate Robert Wolford who used to hang out in this area.
Residents say the plot of land has been an empty lot for 30 years. It's now populated by drug users and the homeless.
Neighbors say a dozen FBI agents and Wolford were here for five hours Wednesday, surveying the area before the dig.
"We believe that he had something to do with Amanda Berry's death and he told them he would tell them where the body was buried if he got a lesser sentence," neighbor Cynthia Conner said.
Excavators are working in small 10 foot by 10 foot areas at a time. It is painstaking work, particularly in the is heat. There is no deadline so it's difficult to say how long this could take.
"A case like this never closes until it is solved so we will never close this case," FBI Special Agent Vicki anderson said.
Cuyahoga County Prosecutor Bill Mason was at the scene earlier Thursday morning. He considers this a credible tip. He expects investigators will find something but stopped short of giving anymore detail.