Air safety officials are focusing on engine fan blades in their investigation of what caused a massive aboard a Boeing 777-222 commercial airliner Saturday, strewing huge aircraft parts across neighborhoods in suburban Denver.

This engine failure may be related to several others stretching back for years, but first let’s review the details of the most recent event.

United Airlines Flight 328, bound for Honolulu, reported right engine failure shortly after leaving Denver International Airport at 12:49 p.m. The engine caught fire and began to disintegrate as passengers recorded and the failing engine in flight.

Chad Schnell was among the passengers with a front row view of the damaged and burning engine. This is what he saw outside the window:

Some of the missing engine pieces ended up

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