UPDATE 11/18/2013 2:12 PM ET: No word yet on the injured zookeeper's condition, but it's now being reported that a gazelle has become the incident's first official casualty. Spooked by the attack ...

Zoo officials said they were investigating the cause of the attack, as well as mourning the loss of their 1-year-old male Dama gazelle named Tony. “It’s a terrible loss for us today,” zoo ...