DALLAS -- The Dallas Zoo says a female lion died Sunday after it was attacked by another lion.
The attack was witnessed by guests at the zoo.
In a tweet, the zoo said workers were "heartbroken" over the attack that killed the animal known as Johari, and urged others to send good wishes to the staff.
The lions are part of the zoo's Giants of the Savanna exhibit in a section called Predator Rock, featuring five lions and two cheetahs, according to an undated news release from the zoo.
The lion exhibit was closed pending an investigation into what happened.