A child was rescued after falling into the gorilla enclosure at the Cincinnati Zoo Saturday, Cincinnati police and fire departments confirm.

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A 3-year-old boy was hospitalized with serious injuries and a gorilla was shot dead after officials said the boy climbed through a railing and fell into a moat at the Cincinnati Zoo's gorilla enclosure.FULL VIDEO: Gorilla grabs child who's fallen into habitatA 17-year-old, 400-pound male lowland gorilla, Harambe, was shot and killed by the zoo's dangerous animal response team about 10 minutes after the boy made it into the enclosure.Watch the press briefingZoo director Thane Maynard said that the boy crawled through the railing and fell into the moat just before 4 p.m. Saturday. A Cincinnati fire department incident report says that the gorilla "was violently dragging and throwing the child" when they were called.The child was in between the gorilla's legs when the gorilla was shot, fire officials said.PHOTOS: Gorilla reacts to child who's fallen into enclosure"It's a sad day all around," Maynard said. "They made a tough choice and they made the right choice, because they saved that little boy's life. It could have been very bad."Three gorillas were in the enclosure when the boy fell in the moat. Two were called out of the enclosure immediately, but the third — Harambe — stayed in the yard.One woman said that she saw the gorilla drag the boy from one end of his habitat to the other.Watch: Witness describes incidentWitnesses said they saw a woman crying and that the child was conscious during the rescue.The child was released from Children's Hospital Saturday night. His name has not been released.The gorilla was not tranquilized because when the animal is agitated, Maynard said, the tranquilizer may not take effect right away. This was the first time Cincinnati Zoo officials have killed an animal in this manner, Maynard said.The zoo also said this is the first security breach at Gorilla World since it opened in 1978.The zoo houses 11 gorillas, according to its website. Gorilla World will be closed indefinitely, but the zoo will open as usual Sunday, the zoo said.In March, two polar bears breached security and made it into a secure hallway, but not loose in the zoo, before they were contained.The zoo posted a video of Harambe on Facebook in January.Harambe eating celeryNOTE: Though officials said that the boy is 4, he is 3, a family spokesperson told WLWT.