Native American remains were unearthed by construction crews working in Menlo Park on Tuesday, police said.
The discovery was reported to police after workers who were removing a concrete surface in the 1000 block of Hamilton Avenue found what appeared to be two human skulls and other bone fragments, Menlo Park police spokeswoman Nicole Acker said.
Construction was halted, and the San Mateo County coroner's office was called to the scene. The coroner's office determined that the remains were Native American.
Menlo Park lies within an area once occupied by the Ohlone tribe, according to the city's planning department. A known burial site lies just west of the property on Hamilton Avenue, which is owned by the biological research firm Pacific Biosciences, Acker said. She said proper protocol for handling archeological remains is being followed.
The Native American Historical Society was notified of the find and is expected to take possession of the bones sometime today. Construction work remains suspended.