From the pictures, impossible to from outside. Believe that the incident from the inside. Due to the cracks of the glass outside the room according to the attached by a cable.May be caused by a guest breaks. Or to bed without caution, breaking the glass, which can't check
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![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)