Gully glass bridge breakage causes

***Vibration. A group of women dancing on the glass bridge in the ravine, security guards one after another to discourage them "do not jump, the bridge to break", the women ignore the words of the security guards, continue to sing and dance on the bridge, and finally because of the violent dance triggered *** vibration effect led to the bridge broke, all the women have varying degrees of fall injuries, serious legs are was broken.