premise: The San Francisco zoo has two different kinds of tigers, two Siberian and one Sumatran tigers. The Siberian tigers are named Tony and Tatiana while the Sumatran is named Padang. It is not yet known which of the two Siberian tigers was involved in the attacks. Last year, another zoo worker was seriously injured by Tatiana while attempting to feed her, but survived the attack.
hypothesis: A tiger attacked three people in San Francisco.