A few visitors at a zoo in the United States were in for a shock after one of the gorillas in a glass enclosure charged at them and managed to break the glass.

Though it is unclear as to when it occurred, a video of the incident that took place in the Henry Doorly Zoo in Omaha, Nebraska has triggered off an active discussion online.

The video which was posted on Reddit and titled 'A three piece inch of glass between life and death,' shows a girl pounding her chest, following which the silverback gorilla charges and slams himself against the glass.

The Daily Dot managed to find an interesting comment from the reddit post of Redditor GroundhogNight sharing a similar experience from a visit to the Cleveland Zoo during his childhood, which might explain this incident as well.

Watch the video here.