SAN CARLOS (CBS SF) – A construction crew unearthed human remains Wednesday morning while installing new plumbing lines in San Carlos, according to the San Mateo County Sheriff’s Office.

The workers discovered what appeared to be a human skull in the 600 block of Prospect Street around 11 a.m., sheriff’s officials said.

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Construction was halted while sheriff’s detectives and investigators from the San Mateo County coroner’s office arrived and began an investigation.

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More bones were found after coroner’s officials arrived, according to the sheriff’s office.

The bones were taken to be examined by a forensic anthropologist.

Authorities believe the remains may be part of a Native American burial site.

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