"The roof of the Transvaal park could not cave in by itself. Something must have caused it to cave in. The bearing of the swimming centre alone could cause the collapse," Mr Kosovan said in a radio interview.
He said the bearing columns' safety factor had been designed at 15%. The basement was not deformed and no other changes were found in there. Water accumulated in the basement could hardly contribute to the collapse, according to Mr Kosovan.
Although the collapse of the park's roof is not officially treated as a terrorist act, this version has not been ruled out completely. Mr Kosovan said the commission would make the final conclusion on the cause of the accident, which left 26 people dead, after analysing all available material.
