Harambe the gorilla and a three-year-old boy.
Media playback is unsupported on your device
Video

Mother: 'He's dragging my son, I can't watch this'

Audio of a 911 call made by a mother whose three-year-old son fell into a gorilla enclosure has been released.

The boy suffered minor injuries in the incident.

Cincinnati Zoo says it had no choice but to kill Harambe, a 17-year-old gorilla.

Go to next video: Zoo defends gorilla shooting