https://www.flightglobal.com/news/articles/ntsb-detects-signs-of-uncontained-engine-failure-fro-416634/
Preliminary findings released by the US National Transportation Safety Board on 10 September indicated multiple breaches of the engine fan case in the region of the high-pressure compressor.
Several pieces of about 17.8-20.3cm (7-8in) in length from the high-pressure compressor spool were found on the runway, the NTSB says