I haven't seen anything here about whether ingestion of foreign objects from the runway might be a possible cause - is that a possibility or would you expect that to cause a problem immediately rather than the 10-15mins after take-off that it seems to have taken? Thanks
It really depends what you mean by foreign objects. Any sizeable debris would not cause this sort of failure. To reach the turbine stage the debris would have to make it through multiple compressor and stator stages, through the combustor and past the turbine entry stator. That's massively unlikely to happen. I suppose you could get some sort of dust ingestion (think Volcanic ash) but even then the turbine disk would not fail if the blades around the disk were contaminated with dust.