A victim in the San Francisco Zoo tiger attack has admitted to having yelled and waved at the tiger that attacked him and his brother and killed his friend, police said Friday.

According to an affidavit filed Thursday, Paul Dhaliwahl, 19, told the father of his friend Carlos Sousa Jr., 17, who was killed by the 250-pound Siberian tiger on Christmas Day, that all three of the young men had smoked pot and each had couple shots of vodka before going to the zoo. The teenager...