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An incident in which glass shattered on to a footpath outside the University of Otago in December was not caused by ''glass impurities'', an investigation by the university has found.
The investigation found that a sheet of glass on the roof of a walkway probably shattered on to the Cumberland St footpath due to friction between the glass and a stainless steel bolt, university director of property services Barry MacKay said.
''The university is currently considering options for replacing this panel and the other glass panels that were removed from this walkway as a safety precaution,'' Mr MacKay said.
The incident in the week before Christmas came as the university was carrying out a wider investigation after earlier problems with spontaneously shattering glass. Mr MacKay said this ''separate'' investigation by property services was still under way.