By Jaxon Van Derbeken, Vivian Ho and Nanette Asimov

Courtesy of Mathew Sumner/Special To The Chronicle Officer Chris Porter leaves the home 0n Masonic Avenue that police searched for evidence in the Kevin Collins case. Courtesy of Mathew Sumner/Special To The Chronicle

Federal and local law enforcement officers searched a home in San Francisco's Haight-Ashbury neighborhood as part of a renewed probe into the 1984 disappearance of 10-year-old Kevin Collins, but found little except apparent animal bones, authorities said.

Cadaver dogs brought in by San Francisco police and the FBI detected remains under the concrete floor of the garage in the duplex at 1106-1108 Masonic Ave., a block from where the boy was last seen, police said. Authorities had the floor jack-hammered, but what they found appear to be the bones of an unidentified animal, police said.

Further tests will be done to confirm the source of the remains, police said.

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Source: San Francisco Chronicle