An investigation finds that a pilot's lit cigarette caused a deadly 2016 plane crash.

In 2016, a Paris-Cairo EgyptAir flight crashed, killing all 66 passengers.

A fire in the cockpit caused the crash, according to the Italian newspaper Corriere della Sera.

An investigation found that the pilot's lit cigarette in the cockpit caused the 2016 EgyptAir plane crash that killed all 66 on board.

According to the Italian newspaper Corriere della Sera, investigators determined that the burning cigarette combined with escaping oxygen from the co-mask pilot's caused a fire on board Flight 804.

According to the report, the co-oxygen pilot's mask was changed three days before the crash and set to "emergency mode," causing a fire when leaked oxygen ignited a lit cigarette.

EgyptAir had not yet banned smoking in the cockpit, the Independent reported.

On May 19, 2016, EgyptAir 804 crashed into the Mediterranean Sea, killing all 66 people on board.

A 2019 report commissioned by France's justice ministry said the plane should never have taken off from Paris due to maintenance issues.

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