<p>An empty vodka bottle was also found in a car used by Amritpal Dhaliwal, 19, and his brother, Kulbir, 23, on the day of the mauling, which left 17-year-old Carlos Sousa Jr. dead, according to the source.</p>
<p>The discoveries could be an indication that the brothers may have taunted the 350-pound Siberian tiger before it leapt from its grotto.</p>