ORLANDO, Florida (CNN) -- Authorities cordoned off the home of missing toddler Caylee Anthony's grandparents on Thursday, hours after the remains of a small child were found nearby.

Investigators have sealed off the Anthony home, which shows a large Caylee poster.

The sheriff's office in Orange County, Florida, said it is seeking a warrant to search the home of George and Cindy Anthony.

Sheriff Kevin Beary said the home has been secured "pending more investigation." The house has the "possibility of being more of a crime scene later," he added.

A child's skull was found at about 9:30 a.m. by a utility meter reader who alerted authorities, sheriff's spokesman Jim Solomons said. Investigators, including those from the Anthony case, rushed to the scene, he added. Watch investigators swarm the scene »

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Prosecutors have asked police not to disclose many details surrounding the discovery, Beary said.

Caylee Anthony, 3, has been missing since June in a case that has received national attention. Casey Anthony, the child's 22-year-old mother, was charged last month with murder and other offenses. She is being held at the Orange County Jail.

The area where the remains were found had been searched as part of the investigation into Caylee's disappearance, he said. But the precise spot where a county meter reader found them -- "45, 50, 60 feet back" from the street -- was flooded at the time of the search.

No clothes were found with the remains, Beary said.

Asked whether the remains could belong to another child, Beary said, "Not that