Police are today reportedly investigating whether one or more of the young men mauled by a tiger at the San Francisco Zoo may have taunted the animal.

The big cat exhibit at San Francisco Zoo was cordoned off as a crime scene today as investigators probed whether a 21-stone Siberian tiger that killed a visitor escaped from its high-walled pen on its own, or was let out deliberately.

SAN FRANCISCO’S mayor has defended releasing a police video that showed a white officer driving over a black homeless woman and poking fun at racial stereotypes, amid criticism he was hasty in condemning the clips.

One police officer was suspended and others faced discipline after making videos that used racist, sexist and homophobic stereotypes, officials said.

Rescuers searching for three young children who were reportedly tossed in San Francisco Bay have found one body.