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Duke Flores, 6, is seen in this photo from the Apple Valley Police Department.

A search has entered its second week at a Mojave Desert landfill where authorities believe the body of a 6-year-old boy is buried.

The San Bernardino County Sheriff’s Department says homicide detectives, 11 other department employees, 20 volunteers and 1 search dog were on the scene Monday at the Victorville landfill.

But Monday’s efforts concluded without any discoveries, officials said.

The operation was expected to resume Tuesday morning.

The search for the remains of little Duke Flores has been underway since late last month, when a welfare check requested by a relative led to the arrest of his mother and aunt in Apple Valley.

Authorities began digging through about 1,200 tons of refuse at the Victorville landfill last Monday.

The boy’s mother and aunt have pleaded not guilty to murder charges.

KTLA’s Erika Martin contributed to this report.