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I suppose we might never know the exact cause but, after seeing the graphics (from the link above) it might be possible that there was a tyre blow-out. That could have caused the bus to veer to the right and hit the wall, the first time. Then, it has rebounded and the driver might've over-corrected, causing the second, much more serious impact.
All pure speculation on my part. Perhaps best to leave it until the official investigation is concluded and reported.
My sympathies to all involved.
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