Aviation Herald says "a blade" fractured - no mention of location (fan, compressor, turbine). Engine core ingested the blade, breaking other parts.
Engine was shut down, but 1) it might still freewheel in the slipstream, and/or 2) the original vibrations may have shaken something else loose (nacelle, pylon, inlet lining) that also rattled and vibrated in the airstream.
Any given engine failure may produce its own pattern of damage and "knock-on" effects. 90 minutes of shaking after shutting down an engine is not something I've encountered (outside of The High and the Mighty) - but someone probably has.