Police in Ohio, USA are looking into the shooting of a 17-year-old gorilla at Cincinnati Zoo. They will find out the facts about the killing of Harambe the gorilla after a four-year-old boy fell into the ape's cage. Video shows the gorilla dragging the boy through water in his cage for ten minutes. Some people at the zoo said they were worried about the boy's safety. Other people said the gorilla was protecting the child and that the animal was upset by the noise from the crowds of people looking at it. Zookeepers decided to shoot the gorilla because they were worried about the boy's life.

Animal rights groups are angry that the gorilla was killed. They say zookeepers should have shot Harambe to make him sleep. Zookeepers said it takes too long to make a 200kg gorilla sleep and that the boy was in danger. There is now an online petition that 300,000 people signed. They say 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 no parent can watch their children every second. She said: "As a society, we are quick to judge how a parent could take their eyes off their child."