Earlier reports suggested the men may have been attacked by a lion.
Police were deployed to find the animal, which had been sheltering in a warehouse, AFP news agency says.
A spokeswoman for the interior ministry said the killing happened in the city's central square.
One eyewitness : "It was a white tiger, a big one. It attacked a man, it seized him by the throat."
Need for emergency response plan suitable for natural disaster like this.