Police in the US of Ohio are going to look into the of a 17-year-old gorilla at Cincinnati Zoo. They will investigate the around the killing of Harambe the gorilla after a four-year-old boy fell into the ape's on Saturday. Video showed the gorilla dragging the boy through water in his cage for up to ten minutes. Some people who were at the zoo said they were worried about the little boy's . Other people said the gorilla was trying to protect the child and that the animal was becoming by the noise from the crowds of people looking at the event. Zookeepers made a to shoot the gorilla because they feared for the boy's .
Animal rights groups are very that the gorilla was shot and killed. They say zookeepers should have used a tranquilizer on the animal to put it to sleep. Zookeepers say it would have taken too for the 200kg gorilla to be sedated. They say this would have been too . There is now an online that 300,000 people have signed to hold the boy's mother and the zoo for Harambe's death. Many people say the mother should have looked after her son to stop him from falling into the gorilla's area. The mother said no in the world can watch their children every . She said: "As a society, we are quick to judge how a parent could take their off their child."