A beautiful spring morning at the Topeka Zoo in Kansas turned tragic when a male Sumatran tiger attacked a keeper, inflicting wounds that sent her to a hospital.Although keepers are never supposed to be in the same space as the tigers, they found themselves together in the outdoor habitat that morning for reasons under investigation."There's some sort of error that occurred here," said Brendan Wiley, the zoo's director, told a news conference. He confirmed that several visitors to the zoo had witnessed the attack.The employee is the zoo's primary tiger keeper and had worked there for years, according to Mr Wiley, who noted that part of her job is to clean and maintain the enclosure. He said that the keeper was in stable condition and that the zoo was reviewing its safety protocols.The zookeeper, whom Mr Wiley declined to name, citing her family's need for privacy, suffered "lacerations and punctures" to the back of the head, neck, back and arm. She w...