U.S. police are looking into the killing of a 17-year-old gorilla at a zoo. Zookeepers shot Harambe the gorilla after a four-year-old boy fell into his cage. Video shows the gorilla dragging the boy through water for ten minutes. Zoo visitors were worried about the boy's safety. Others said the gorilla was protecting him. They said Harambe was upset by the crowd of people looking at him. Zookeepers shot Harambe as they were worried about the boy.
Animal rights groups are angry that the gorilla was killed. They say zookeepers should have made Harambe sleep. Zookeepers said it takes too long to make a 200kg gorilla sleep. Over 300,000 people signed an online petition saying the boy's mother and the zoo are responsible for Harambe's death. People think the mother should have looked after her son better. The mother said: "We are quick to judge how a parent could take their eyes off their child."