The search warrant was served in the 1100 block of  Masonic Street following up on the nearly three-decade old cold case in which  the missing boy vanished from a San Francisco street.

      The FBI and cadaver dogs from the Alameda County Sheriff's Office  assisted in the search, and the dogs indicated that there were possible  remains under the concrete floor of the home's garage.

      The concrete was removed and several bones were located and turned  over to the San Francisco medical examiner's office. Police said that a  preliminary assessment of the bones indicates that they are from an animal,  but that further analysis is necessary.

      Police said that the home's current residents are not suspects in  the disappearance.

      The search warrant remains sealed and the investigation is  ongoing, according to police. 

      A neighbor who declined to give her name said police had been  coming and going all day and were digging at a property nearby.

      Arthur Wentworth, who lives next door to the home where the search  warrant was served, said authorities had told neighbors they were serving a  search warrant but gave no other details.

      He said there had been police activity at the home since the  morning, and that he had heard drilling and seen men wearing hardhats.

      As of about 6 p.m., most of Masonic Street remained blocked off  and police continued their investigation at the home.

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